Which statement about the OSPF Loop-Free Alternate feature is true?

Which statement about the OSPF Loop-Free Alternate feature is true?

A.
It is supported on routers that are configured with virtual links.

B.
It is supported in VRF OSPF instances.

C.
It is supported when a traffic engineering tunnel interface is protected.

D.
It is supported when traffic can be redirected to a primary neighbor.