During an Audit of a Branch Bank, an Internal Auditor

During an audit of a branch bank, an internal auditor learned that a series of system failures had resulted in a four-day delay in processing customers' scheduled payroll direct deposits. The first failure was that of a disk drive, followed by software and other minor failures. Which of the following controls should the auditor recommend to avoid similar delays in processing?

A) Contingency planning.
B) Redundancy checks.
C) Process monitoring.
D) Preventive maintenance.