Refer to the graphic.

What is a potential problem if the MPLS-enabled ATM switch C reuses an already allocated local
label (2/82)
for the second upstream LDP peer (router B)?

A.
Cell interleaving issues at egress of MPLS-enabled ATM switch C.

B.
Security concerns at the ingress of the MPLS-enabled ATM switch C.
Another router connected to MPLS enabled ATM switch C can send a packet and spoof the label
(2/82).

C.
Label lookup issues at the ingress of MPLS-enabled ATM switch C if per-interface label
allocation is not used.

D.
Label lookup issues at the ingress of MPLS-enabled ATM switch C if per-platform label
allocation is not used.