题目内容（请给出正确答案）

[主观题]

Two devices on an Ethernet segment sent frames at the same time causing a collision. Which twostatements are true？（）

A. Both devices stop transmiting, wait a random period of time, verify the wire is idle, and re-transmit

B. The device with the lowest MAC address is permitted to retrannsmit first

C. The device with the lowest MAC address sends a jam signal to notify all other devices of the collision

D. Both devices send a jam signal to notify all other devices of the collision

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