Fault-tolerance is a feature particularly sought-after in which of the following kinds of computer systems
(choose all that apply):

A.
desktop systems

B.
laptop systems

C.
handheld PDAs

D.
business-critical systems

E.
None of the choices.

Explanation:
Fault-tolerance enables a system to continue operating properly in the event of the failure of some parts of it. It
avoids total breakdown, and is particularly sought-after in high-availability environment full of businesscritical
systems.