An IS auditor performing an independent classification of systems should consider a situation where functions
could be performed manually at a tolerable cost for an extended period of time as:

A.
critical.

B.
vital.

C.
sensitive.

D.
noncritical.

Explanation:
Sensitive functions are best described as those that can be performed manually at a tolerable cost for an
extended period of time. Critical functions are those that cannot be performed unless they are replaced by
identical capabilities and cannot be replaced by manual methods. Vital functions refer to those that can be
performed manually but only for a brief period of time; this is associated with lower costs of disruption than
critical functions. Noncritical functions may be interrupted for an extended period of time at little or no cost to
the company, and require little time or cost to restore.