Final answer:
The POST can issue beep codes for failures related to the video card and CPU, but not for a missing network connection.
Step-by-step explanation:
The POST (Power-On Self-Test) is a diagnostic program that runs when a computer is turned on and checks if the hardware components are functioning properly. It can issue beep codes to indicate specific failures during the boot process. For the given options, the failures that would result in POST issuing beep codes are:
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