Which statement about the offer/answer model of SDP is correct?

Question

Options

• AOffer/answer cannot be considered complete when it happens in an INVITE/18x exchange.
• BPRACK message must not carry SDP, or else offer/answer will not work.
• COffer must be included in the initial INVITE; otherwise, offer/answer cannot complete.
• DIt is best to start a call without an offer and wait for an answer.
• EACK message can carry the SDP answer.

• A
  9% (4)
• B
  2% (1)
• C
  2% (1)
• D
  4% (2)
• E
  83% (38)

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