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

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

Exhibit:

A.
The serial connection to the MidEast branch office.

B.
The serial connection to the DeepSouth branch office.

C.
The serial connection to the NorthCentral branch office.

D.
The serial connection to the Multinational Core.