Which tool should you run?

A company has an Office 365 tenant.
You need to monitor Active Directory synchronization.
Which tool should you run?

A.
ldFix

B.
Office 365 Health, Readiness, and Connectivity Check

C.
Microsoft Remote Connectivity Analyzer Tool

D.
Synchronization Service (MIISClient)

Explanation:
dFix is used to perform discovery and remediation of identity objects and their attributes in an onpremises Active Directory environment in preparation for migration to Office 365. IdFix is intended
for the Active Directory administrators responsible for DirSync with the Office 365 service.

IdFix DirSync Error Remediation Tool
http://www.microsoft.com/en-us/download/details.aspx?id=36832