Which two actions will achieve the goal?

A company has a hybrid SharePoint environment and account information is synchronized between Active Directory Domain Services (AD DS) and Office 365.
You observe that AD DS accounts are not synchronized with Office 365.
You need to monitor account synchronization between Active Directory and Office 365.
Which two actions will achieve the goal? Each correct answer presents a complete solution.
A. Run the following Windows PowerShell cmdlet: Start-OnlineCoexistenceSync
B. Use the Onramp for Office 365 tool.
C. Use the Azure Active Directory Synchronization Services tool.
D. Use the Forefront Identity Manager client.

Correct Answer: CD
Explanation/Reference:
The following diagram shows the Azure AD Connect tool on a virtual machine in Azure (the DirSync server) synchronizing on-premises AD DS to Office 365.

Azure AD Connect tool on a virtual machine in Azure synchronizing on-premises accounts to the Azure AD tenant of an Office 365 subscription with traffic flow. The Azure Active DirectorySynchronization Services tool lists a history of past synchronizations including any synch errors.
Forefront Identity Manager with the Azure Active Directory Connector configured can also be used to monitor account synchronization Active Directory.
Reference:https://technet.microsoft.com/en-us/library/dn635310.aspx