What benefit does AToM provide to the service provider’s customers?

What benefit does AToM provide to the service provider’s customers?

A.
By supporting Layer 2 VPNs, customers maintain control of their site-to-site routings over the
WAN.

B.
By supporting Layer 3 VPNs, a full mesh of virtual circuits will not be required between the
different
customer sites to enable optimal routing.

C.
By supporting secured Layer 3 VPNs, customers do not have to deal with the complexity of
configuring
IPSec.

D.
By supporting MPLS traffic engineering over ATM, customers can better utilize their WAN link.

E.
By supporting Diff-Serv QoS, AToM allows customers to deploy voice/video applications across
the WAN.