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Question:

You're debugging a Mac running macOS. The computer will occasionally fully lock up and display a revolving pinwheel instead of the mouse cursor. It occurs when multiple applications are running. What is the MOST LIKELY source of this issue?

A RAM.
explanation

There are various causes for the spinning pinwheel, often known as the "Spinning Wheel of Death." Sometimes it's a frozen app, but in this case, it's happening while other apps are running, thus hardware is a consideration. The RAM is the most likely source of the problem among the specified devices. A defective hard drive could possibly be at blame.

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