As shown in the figure. LDP is used to establish LSPs on the BGP/MPLS IP VPN backbone network. To enable two sites of User X to communicate through BGP/MPLS IP VPN. PE1 and PE2 must use loopback interface addresses with 32-bit masks to establish an MP-IBGP peer relationship.
To enable two sites of User X to communicate through BGP/MPLS IP VPN, PE1 and PE2 must use loopback interface addresses with 32-bit masks to establish an MP-IBGP peer relationship. This is necessary for the proper functioning of the BGP/MPLS IP VPN, ensuring that the PE routers can recognize each other's loopback addresses correctly and establish a stable IBGP session for routing VPN traffic.
A is correct