What happens when a packet without a VLAN tag is received on a SAP provisioned with null encapsulation while an SDP vc-type is provisioned as vlan?

What happens when a packet without a VLAN tag is received on a SAP provisioned with null encapsulation while an SDP vc-type is provisioned as vlan?
A . The frame is dropped.
B . The service ID is added as the VLAN tag.
C . A VLAN tag of 0 is added as the provider VLAN tag
D . The frame is forwarded with no VLAN tag

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Answer: C