What four layer 2 MPLS VPN parameters are collected from a customer service record database to trouble a VPN connectivity issue? (Choose four)

A.
Attachment circuit information

B.
UNI interface encapsulation

C.
Hop-by-hop LDP information

D.
Virtual circuit ID information

E.
Unique service identifier

F.
PE loopback information

G.
Layer 2 MPLS VPN service type