A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this state ment, what is known about the network interface port?

A. This is a 10Mb/s switch port.

B. This is a 100Mb/s switch port.

C. This is an Ethernet port operating at half duplex.

D. This is an Ethernet port operating at full duplex.

E. This is a port on a network interface card in a PC.