A local area network operates Ethernet with CSMA/CD mechanism and runs at a transmission rate of 8 Mbps and a one-way signal propagation time of 25 microseconds. How long has a station to wait before trying to access the channel again, after experiencing 5 successive collisions?
1. 125 microseconds.
2. 625 microseconds
3. 800 microseconds
4. 1600 microseconds.