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:
One of the first steps you should take before installing DirSync is to look at the directory that you have onpremises and make sure it’s healthy and ready to synchronize to Azure Active Directory.
You need to check Active Directory remediation.
DirSync has certain requirements on attributes in the directory, and aligning the attribute values with the
DirSync requirements is commonly known as Active Directory remediation. To help with Active Directory
remediation, you should use the IdFix tool, which reviews the directory and performs interactive Active Directory
remediation. This tool checks for and helps you correct any invalid data and duplicate data in directory
attributes, including user PrincipalName (UPN), mailNickName, proxyAddress, sAMAccountName,
targetAddress, and others. The IDFix tool also provides assistance for migrating from a non-routable UPN
(such as “domain.local,” for example) to an Internet routable domain name, because using an Internet-routable
domain is one of the requirements for Azure Active Directory. Be sure to run the IdFix tool from within your
network, so that it has access to the domain controllers.
https://blogs.office.com/2014/04/15/synchronizing-your-directory-with-office-365-is-easy/