With regard to graphics, what is the “dirty rect”?

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Question:With regard to graphics, what is the “dirty rect”?

1.An object that is passed as an argument to the invalidate() method to denote the portion of screen that should be redrawn.

2.An area of screen that is not illuminated on the display when in ambient mode.

3.both (a) and (b)

4.None of the above

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  1. With regard to graphics, what is the “dirty rect”?
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