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单选题
A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port()。
A

This is a 10 Mb/s switch port

B

This is a 100 Mb/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


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