Which connection uses the default encapsulation for serial interfaces on Cisco routers?

A.
The serial connection to the NorthCoast branch office.
B.
The serial connection to the North branch office.
C.
The serial connection to the Southlands branch office.
D.
The serial connection to the Multinational Core.
Explanation:
Hmmm I think HDLC is the default encapsulation, so a Serial that isn’t specifically defining an encapsulation would be using that (i.e. Serial1/1 going to North branch office). PPP is used on both Serial1/2 and Serial1/3 in this exhibit so I’m not sure why A is the correct answer.
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I agree with Mammoth. I think the answer to this question is incorrect.
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Correct answer is North
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