You deploy a Skype for Business Server 2015 Persistent Chat server named atl-cs-001.litwareinc.com. You need to remove a

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You deploy a Skype for Business Server 2015 Persistent Chat server named atl-cs-001.litwareinc.com.
You need to remove all messages prior to March 1, 2015 from a chat room named LegalChatRoom.
Which two Skype for Business Server 2015 Management Shell commands will achieve the goal? Each correct answer presents a complete solution.

A. Set-CsPersistentChatRoom –Identify LegalChatRoom –Managers @{Add="sip:[email protected]"}
B. Remove-CsPersistentChatRoom –Identity "atl-cs-001.litwareinc.com\LegalChatRoom"
C. Clear-CsPersistentChatRoom -Identity "atl-cs-001.litwareinc.com\LegalChatRoom" –EndDate"3/1/2015"
D. Remove-CsPersistentChatMessage –Identity "atl-cs-001.litwareinc.com\LegalChatRoom" –EndDate "3/1/2015"