Which two SDP content headers can be found in a SIP INVITE message?

Which two SDP content headers can be found in a SIP INVITE message? (Choose two.)

A.
Expires

B.
Contact

C.
Connection Info

D.
Media Attributes

E.
Allow

F.
CSeq

Explanation:
Connection info is optional field in sdp wheather Media attributes decide the codec

and media type for that call.