What statement is TRUE regarding service chaining provided by Nuage VCS?

What statement is TRUE regarding service chaining provided by Nuage VCS?
A . Service chaining is flow-based traffic redirection.
B . Service chaining only works for virtual appliances.
C . A virtual firewall is required to perform service chaining.
D . It consists of packets being forwarded by the local VPLS, then through the enterprise VPRN and lastly the backhaul VPL

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Answer: B