Which components should you recommend?

You have a Skype for Business Server 2015 infrastructure.
You plan to provide remote users with the ability to establish the following:
Peer-to-peer calls between themselves and users on the internal network
Chat sessions from mobile devices
You need to recommend which components you must configure to provide the required access to the remote users.
Which components should you recommend?
To answer, drag the appropriate component to the correct requirement in the answer are a. Each component may be used once, more than once, or not at all. Additionally, you may need to drag the split bar between panes or scroll to view content.
Select and Place:

Correct Answer:

Explanation/Reference:
Box 1: the Access Edge service
Box 2: the A/V Edge Service Box 3: a reverse proxy Note:
* The Edge Servers send and receive network traffic for the services offered by internal deployment by external users.
The Edge Server runs the following services:
/Access Edge service The Access Edge service provides a single, trusted connection point for both outbound and inbound Session Initiation Protocol (SIP) traffic.
/Web Conferencing Edge service The Web Conferencing Edge service enables external users to join meetings that are hosted on your internal Lync Server 2013 deployment.
/A/V Edge service The A/V Edge service makes audio, video, application sharing, and file transfer available to external users. Your users can add audio and video to meetings that include external participants, and they can communicate using audio and/or video directly with an external user in point-to-point sessions.
The A/V Edge service also provides support for desktop sharing and file transfer.
Authorized external users can access the Edge Servers in order to connect to your internal Lync Server 2013 deployment, but the Edge Servers do not provide a means for any other access to the internal network.
* the A/V Edge servers are able to accept connections for peer-to-peer calls and conference calls. * The Reverse Proxy server is an optional, external component that is not a Lync Server role and is not defined in the
Lync Topology. The reason this component is considered optional is because without it deployed an external Lync client can still connect to Lync and most features will function (IM, Presence, Calls, Desktop Sharing, etc) as will federated communications.
The reverse proxy is required for the following:
To allow users to connect to meetings or dial-in conferences using simple URLs
To enable external users to download meeting content
To enable external users to expand distribution groups
To allow the user to obtain a user-based certificate for client certificate based authentication
To enable remote users to download files from the Address Book Server or to submit queries to the Address Book
Web Query service
To enable remote users to obtain updates to client and device software
To enable mobile devices to automatically discover Front End Servers offering mobility services
To enable push notifications to mobile devices from the Office 365 or Apple push notification services