When designing an MPLS-based LAN extension between DC-1 and DC-2, what are three advantages of deploying VSS?

Refer to the exhibit.

When designing an MPLS-based LAN extension between DC-1 and DC-2, what are three advantages of deploying VSS? (Choose three.)
A . Layers 2, 3, and 4 flow-based load balancing
B . native VSS and MEC failover without using scripts
C . sub-second failover
D . required to configure VPLS
E . failover time depends on Cisco IOS EEM and STP convergence
F . limited VLAN-based VPLS traffic hashing

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Answer: A,B,C