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 . They are only supported on the IPSO Operating System.
B . VTIs cannot be assigned a proxy interface.
C . VTIs can only be physical, not loopback.
D . Local IP addresses are not configured, remote IP addresses are configured.

Answer: A