What is the likely cause of an iMac (21.5-inch, Late 2013) producing a single error tone at startup that repea

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What is the likely cause of an iMac (21.5-inch, Late 2013) producing a single error tone at
startup that repeats every five seconds.

A.
The unit does not have RAM or RAM is not installed properly.

B.
The hard drive has failed S.M.A.R.T. status.

C.
The logic board has failed and must be replaced.

D.
The RAM does not pass data integrity tests.

Explanation:

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