Which of the following BEST describes the difference between SCSI-1 and SCSI-2?

Which of the following BEST describes the difference between SCSI-1 and SCSI-2?

A.
SCSI-1 can transfer data at up to 10 MBps while SCSI-2 can transfer data at up to 20 MBps.

B.
SCSI-1 has a bus width of 8 bits while SCSI-2 has a bus width of 16 bits.

C.
SCSI-1 has a maximum cable length of 10 feet (3 meters) while SCSI-2 has a maximum cable length of 20 feet (6 meters).

D.
SCSI-1 has a bus speed of 20 MHz while SCSI-2 has a bus speed of 40 MHz.

Explanation:
SCSI-1 has a data bus width of 8 bits (1 byte), has a maximum cable length of 20 feet (6 meters), supports up to eight devices, has a bus speed of 5 MHz, and a maximum transmission speed of 5 MBps (1 byte 5 MHz = 5 MBps). SCSI-2, which is also called

Wide SCSI, has a bus width of 16 bits.
Incorrect
Answers:
A: SCSI-1 can transfer data at up to 5 MBps, not 10 MBps, while SCSI-2, which is twice as wide, can transfer data at up to 10 MBps, not 20 MBps.
C: Both SCSI-1 and SCSI-2 have a maximum cable length of 20 feet (6 meters).
D: SCSI-1 has a bus speed of 5 MHz, not 20 MHz, while SCSI-2 has a bus speed of 10 MHz, not 40 MHz.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 143-147.