Which URL should you use?

You have an Exchange Server organization. The organization contains a server named EX01 that has
Exchange Server 2010 installed and a server named EX02 that has Exchange Server 2013 installed.
Your mailbox is hosted on EX01.
You need to access the Exchange Admin Center (EAC).
Which URL should you use?

A.
https://EX01/ecp?ExchClientVer= 14

B.
https://EX02/ecp?ExchClientVer= 15

C.
https://EX02/eac?ExchClientVer=15

D.
https://EX01/ecp?ExchCfientVer=15