Which statements best describe auto discovery VPN (ADVPN). (Choose two.)

Which statements best describe auto discovery VPN (ADVPN). (Choose two.)
A . It requires the use of dynamic routing protocols so that spokes can learn the routes to other spokes.
B. ADVPN is only supported with IKEv2.
C. Tunnels are negotiated dynamically between spokes.
D. Every spoke requires a static tunnel to be configured to other spokes so that phase 1 and phase 2 proposals are defined in advance.

Answer: A,C