The data rate is 10 Mbps, the distance between station A and C is 2000 m and the propagation speed is 2 × 108 m/s. Station A starts sending a long frame at time t1 = 0; station C starts sending a long frame at time t2 = 3 µs. The size of the frame is long enough to guarantee the detection of collision by both stations. Find:
a. The time when station C hears the collision (t3).
b. The time when station A hears the collision (t4).
c. The number of bits station A has sent before detecting the collision.
d. The number of bits station C has sent before detecting the collision.