How is internet access provided to a WAN edge router that is connected to a MPLS transport link?

How is internet access provided to a WAN edge router that is connected to a MPLS transport link?
A . OMP advertises a default route from a WAN Edge router that is connected to the MPLS and internet transport networks
B. Internet access must be provided at the WAN Edge router through either a 4G/5G link or local Internet circuit
C. An extranet must be provided in the MPLS transport network to allow private traffic to reach the public internet
D. TLOC extensions are used to route traffic to a WAN Edge router that is connected to the Internet transport network

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Answer: D