A network administrator for the Ciscoexam is adding a new remote site to the existing network infrastructure. DHCP is already provisioned for this site. When the administrator connects the Cisco IP phone to the network, the phone keeps displaying the word "Registering". The administrator is able to ping the phones IP address from a laptop. Which three actions should the administrator take to troubleshoot the problem?

A.	Check DHCP option 67
B.	If a laptop is connected to the PC port, check whether the network driver on the PC is up to date.
C.	Check the NTP configuration on the phone.
D.	Check the DHCP option 150.
E.	Check network connectivity between the phone and TFTP server.
F.	Check network connectivity between the phone and CUCM and CUCM Express servers.