Haha, 'Call Waiting On' to handle more than one call? What is this, the Stone Age? Obviously A is wrong. B is just bizarre. C and D seem like the right options to me.
Option A doesn't make sense, Call Waiting is not a requirement for SIP extension. B is definitely wrong, SIP extension type should be SIP, not H.323. I think C and D are the correct answers here.
Levi
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