An endpoint cannot connect to a valid TFTP server during the registration process. Which two statements describe possible causes? (Choose two.)

A.	The DHCP configuration contains TFTP server 66, but no DNS server is available.
B.	The DHCP configuration contains TFTP server 150, but no DNS server is available.
C.	No separate voice VLAN configuration on the switch port connected to the endpoint.
D.	Cisco Unified Communications Manager CallManager services are not started.
E.	Cisco Unified Communications Manager TFTP services are not started.