Which statement best describes configuring access control lists to control Telnet traffic destined to therouter itself？（）
- AThe ACL applied to the vty lines has no in or out option like ACL being applied to an interface.
- BThe ACL is applied to the Telnet port with the ip access-group command.
- CThe ACL must be applied to each vty line individually.
- DThe ACL should be applied to all vty lines in the in direction to prevent an unwanted user from connecting to an unsecured port.