Which of the following is true of parallel transmission? A. It involves the simultaneous transmission of eight bits. B. The speed is quoted in bits per second. C. It is slower than serial trans¬mission. D. Most microcomputers commu¬nicate with other computers in this mode. E. All of the above are true.

The correct answer is: E. All of the above are true.

Parallel transmission is a method of sending data in which multiple bits are transmitted simultaneously over multiple lines. This is in contrast to serial transmission, in which data is transmitted one bit at a time. Parallel transmission is faster than serial transmission, but it requires more hardware and is more complex to implement.

In parallel transmission, each bit of data is transmitted on a separate line. This means that eight bits of data can be transmitted simultaneously, which is much faster than serial transmission, where each bit of data is transmitted one at a time.

The speed of parallel transmission is quoted in bits per second (bps). This is the number of bits that can be transmitted in one second. The speed of parallel transmission is typically much higher than the speed of serial transmission.

Most microcomputers communicate with other computers in parallel mode. This is because parallel transmission is faster than serial transmission. However, parallel transmission is more complex to implement and requires more hardware.

Therefore, all of the above statements are true about parallel transmission.