You are planning to synchronize your local AD users to Azure AD and Office 365. Which tool should you use to check your Active Directory for issues that could prevent accounts synchronizing to Azure AD?

Answer options:

A.Idfix
B.The SharePoint Migration Assessment Tool
C.Azure Storage Explorer is an app that lets you browse your storage account resources.
D.AD connect synchronization rules editor

Correct Answer: A 
You should run Idfix for identifying and remediating possible synchronization errors prior to deployment to Office 365. Option B is incorrect. This is a migration tool for Sharepoint, OneDrive and Teams.
Option C is incorrect. Azure Storage Explorer is an app that lets you browse your storage account resources.
Option D is incorrect. This is a tool that lets you view and change Azure AD Connect out-of-the-box synchronization rules.
Reference: 
To know more about IdFix, please refer to the link below: 

https://www.easy365manager.com/what-is-idfix/