Which two loopback types are supported for serial interfaces on Juniper devices? (Choose two.)

A.
Local

B.
Far End

C.
Remote

D.
Bidirectional

Explanation:
For serial interfaces Juniper devices support the local and the remote loopback types.
http://www.juniper.net/documentation/en_US/junos12.3/topics/usage-guidelines/interfacesinterface-diagnostics.html