Refer to the exhibit. Which three statements describe the steps that are required to configure an IPsec site-to-site VPN using a GRE tunnel？（）

• A、The command access-list 110 permit gre must be configured to specify which traffic will be encrypted.
• B、The command access-list 110 permit ip must be configured to specify which hosts can use the tunnel.
• C、The tunnel destination 172.17.63.18 command must be configured on the Tunnel0 interface.
• D、The tunnel mode gre command must be configured on the Tunnel0 interface.
• E、The tunnel source Ethernet1 command must be configured on the Tunnel0 interface.
• F、The tunnel source Tunnel0 command must be configured on the Tunnel0 interface.