Which three are optional extensions of the Frame Relay Local Management Interface
specification? (Choose three)

A.
Switched virtual circuit

B.
Virtual circuit status

C.
Simple flow control

D.
Multicasting

E.
Permanent virtual circuit

Explanation:
Optional LMI Extensions:
The LMI specification also defines several optional extensions:
* Global addressing convention
* Multicast capability
* A simple flow control mechanism
* Ability for the network to communicate a PVC’s CIR to the subscriber in a Status message
* A new message type that allows the network to announce PVC status changes without
prompting from the subscriber Implementors may build any, all, or none of these features into their
networks.