When a SIP trunk is added for Call Control Discovery, which statement is true?

When a SIP trunk is added for Call Control Discovery, which statement is true?
A . The SIP trunk is added by selecting SIP Trunk and SIP Protocol. The Enable SAF check box should be selected.
B . The SIP trunk is added by selecting SIP Trunk and SIP Protocol. The Trunk Service Type should be Call Control Discovery.
C . The SIP trunk is added by selecting Call Control Discovery Trunk and then selecting SIP as the protocol to be used.
D . The SIP trunk is added by selecting SIP Trunk and SIP Protocol. The destination IP address field is configured as `SAF’ to indicate that this trunk is used for SA

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Answer: B