Select the three valid LMI extension:

A.
Multicasting

B.
Global addressing

C.
Forward-explicit congestion notification (FECN)

D.
Virtual circuit status messages.

E.
Backward-explicit congestion notification (BECN)

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.