Which additional feature does MPLS DiffServ tunneling support?

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Which additional feature does MPLS DiffServ tunneling support?
A . matching EXP and DSCP values
B . PHB layer management
C . using GRE tunnels to hide markings
D . interaction between MPLS and IGP

Answer: B

Explanation:

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_diffserv/configuration/15-mt/mp-te-diffserv-15-mt-book/mp-diffserv-tun-mode.html