A and B are the only two stations on an Ethernet. Each has a steady queue of
frames to send. Both A and B attempt to transmit a frame, collide, and A wins
the first backoff race. At the end of this successful transmission by A, both A and B attempt to transmit and collide. The probability that A wins the second backoff race is
(a) 0.5 (b) 0.625 (c) 0.75 (d) 1.0