Router(config-line)#access-class 23 in
A-Only clients denied in access list 23 can manage the router.
B-Only telnet access (TCP) is allowed on the VTY lines of this router
C-Only clients permitted in access list 23 can manage the router
D-Only SSH access (TCP 23) is allowed on the VTY lines of this router.
Answer:C
Router(config-line)#access-class 23 in
A-Only clients denied in access list 23 can manage the router. B-Only telnet access (TCP) is allowed on the VTY lines of this router C-Only clients permitted in access list 23 can manage the router D-Only SSH access (TCP 23) is allowed on the VTY lines of this router.