To improve server system performance, which of the following would enable multiple drives to operate in parallel and thereby improve the performance of stripe sets.

A.
Use SCSI controller cards that support asynchronous I/O.

B.
Upgrade from IDE and SCSI to UltraDMA or Wide Ultra SCSI.

C.
Install separate drives on individual controller cards.

D.
All of the above

Explanation:
When you opt to use SCSI controller cards that support asynchronous I/O, you enable multiple drives to operate in parallel. This improves the performance of stripe sets.
Incorrect
Answers:
B: While upgrading from IDE and SCSI to the faster UltraDMA or Wide Ultra SCSI technologies is always recommended, you must though use SCSI controller cards that support asynchronous I/O if you want multiple drives to operate in parallel.
C: Installing separate drives on individual controller cards has the advantage of spreading read and write operations over multiple controllers.
D: A is the correct option.
References:
Charles J. Brooks, Server+ Certification Exam Cram 2 (Exam SK0-002), QUE Publishing, Indianapolis, 2006, pp. 386-387.