What should you recommend doing first?

You plan to deploy an Exchange Server 2013 organization.
You need to recommend a solution to ensure that a user named User1 can access email messages by using Exchange ActiveSync on an Android device.
The solution must prevent all other users from using Android devices to access email by using Exchange ActiveSync.
What should you recommend doing first?
A. Run the Set-CasMailbox cmdlet.
B. Create a device access rule.
C. Modify the Quarantine Notification settings.
D. Create a mobile device mailbox policy.

Correct Answer: B
Explanation/Reference:
Explanation:
Access the Allow/Block/Quarantine rules

NOT A
Use the Set-CASMailbox cmdlet to set attributes related to client access for Microsoft Exchange ActiveSync, Microsoft Office Outlook Web App, POP3, and IMAP4 for a specified user.
The Set-CASMailbox cmdlet operates on one mailbox at a time. You can configure properties for Outlook Web App, Exchange ActiveSync, POP3, and IMAP4 by using this cmdlet. You can configure a single property or multiple properties by using one statement.
Need to create a rule to allow a particular user to use Exchange ActiveSync on an Android device.
NOT C
Can allow or block access for all users.
Quarantine all uses and then selectively allow the users access.
A new device rule is a better way of managing the problem.

NOT D
Need a policy for a single user.
In Microsoft Exchange Server 2013, you can create mobile device mailbox policies to apply a common set of policies or security settings to a collection of users.
After you deploy Exchange ActiveSync in your Exchange 2013 organization, you can create new mobile device mailbox policies or modify existing policies. When you install Exchange 2013, a default mobile device mailbox policy is created. All users are automatically assigned this default mobile device mailbox policy.
New-ActiveSyncDeviceAccessRule: Exchange 2013 Help