Which port type should the engineer configure on the switch to meet this requirement while maintaining a secure edge implementation?

A service provider is using Cisco ME 3400 Series Ethernet Access Switches on the edge of a Metro Ethernet POP. A customer has a requirement to connect a switch to the network and requires the ability to trunk VLANs on the uplink port into the provider network.

Which port type should the engineer configure on the switch to meet this requirement while maintaining a secure edge implementation?
A . UNI
B . ENI
C . NNI
D . Access

Answer: C