D is corrent because automated equipment controls (hardware controls) are designed to detect, report, or prevent operational errors within the computer. For example, the misreading of magnetic tapes by a tape reader or storage of erroneous data are detected or prevented by the dual-gap heads and parity checks. Other hardware controls are the echo check, dual circuitry, boundary protection, interlock, file protection rings, etc.
A is incorrect because poor management of the computer installation is a human-related error which will not be detected by equipment controls (hardware controls).
B is incorrect because lack of human alertness relates to human error which equipment controls (hardware controls) cannot detect.
C is incorrect because mistakes arising from human-related errors will not be detected by automated equipment controls (hardware controls).
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