which two devices could be installed at the customer site to provide a connection through the local loop to the central office of the provider?

Refer to the exhibit.

The network administrator must complete the connection between the RTA of
the XYZ Company and the service provider. To accomplish this task, which two devices could be
installed at the customer site to provide a connection through the local loop to the central office of
the provider? (Choose two.)

A.
WAN switch

B.
PVC

C.
ATM switch

D.
multiplexer

E.
CSU/DSU

F.
modem

Explanation: