Okay, let me think this through step-by-step. DTMF tones are used for things like phone keypad input, so it needs to be a method that can send that kind of in-band signaling. C MESSAGE seems like the best option for that.
Hmm, this is a tricky one. I'm leaning towards D) C NOTIFY, since that's often used for event notifications, and DTMF tones could be considered an event. But I'm not totally confident.
I'm pretty sure the answer is C MESSAGE. That's the SIP method used for sending arbitrary content, which would include DTMF tones. The other options don't seem as directly relevant.
I'm not sure about this one. I know DTMF tones are used for things like phone menus, but I'm not familiar with the specific SIP methods. I'll have to think this through carefully.
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