Ethernet networks use CSMA/CD as an access method. In CSMA/CD, if a device wants to send a frame in the network, it first determines if the network is free. If the network is not free, the node will wait before sending the frame into a network. If the network is free, it sends the frame; if another device sends a frame simultaneously then their signals or frames collide. When the collision is detected, both packets wait for a random time before retrying.

Token Ring is incorrect because Token Ring uses token passing as the access method.

LocalTalk is incorrect because LocalTalk uses CSMA/CA (Collision Avoidance) as the access method.

100VG-AnyLan is incorrect because 100VG-AnyLan uses demand priority as the access method.