Q: When are mouse actions, such as clicks or movements, detected and processed by the computer?  

Answer: D

Mouse events, such as clicks or movements, are detected and processed by the computer as the user interacts with a document.
These events occur when the user moves or clicks the mouse pointer over elements within the document.
They are initially triggered on the most deeply nested element that the mouse pointer is over, but they also propagate up through the document, allowing for event handling on parent elements.

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