Which of the following is TRUE concerning unnumbered VPN Tunnel Interfaces (VTIs)?

Which of the following is TRUE concerning unnumbered VPN Tunnel Interfaces (VTIs)?

A.
Local IP addresses are not configured, remote IP addresses are configured.

B.
VTIs can only be physical, not loopback.

C.
VTIs must be assigned a proxy interface.

D.
VTIs are only supported on SecurePlatform.