Which one of the following Cisco IOS VPN features simplifies IPsec VPN configuration and design by use…?

Which one of the following Cisco IOS VPN features simplifies IPsec VPN configuration and design
by use of on-demand virtual access interfaces cloned from a virtual template configuration?

A.
DMVPN

B.
dynamic VTI

C.
GRE tunnels

D.
GRE over IPsec tunnels