You need to ascertain whether users can share their free/busy information

You are the Office 365 administrator for your company. You configure new user accounts for User1 and
User2. User1 has an on-premises mailbox. User2 has an Office 365 mailbox.
Each user must be able to view the availability of the other user.
You need to ascertain whether users can share their free/busy information.
What should you use?

A.
Transport Reliability IP Probe (TRIPP Tool)

B.
Microsoft Remote Connectivity Analyzer Tool

C.
Business Connectivity Services

D.
Windows Azure Active Directory Rights Management