What is a constraint of Cisco MPLS TE tunnel configurations?

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What is a constraint of Cisco MPLS TE tunnel configurations?
A . Tunnels cannot span multiple OSPF areas.
B . With ISIS as an IG
C . only older-style metrics are used.
D . Tunnels cannot be configured over IP unnumbered links.
E . QoS-aware tunneling is not supported.

Answer: C