What are two reasons a network administrator would use CDP? (Choose two.)

What are two reasons a network administrator would use CDP? (Choose two.)

A. to verify the type of cable interconnecting two devices B. to determine the status of network services on a remote device C. to obtain VLAN information from directly connected switches D. to verify Layer 2 connectivity between two devices when Layer 3 fails E. to obtain the IP address of a connected device in order to telnet to the device F. to determine the status of the routing protocols between directly connected routers