A real-world example of a plane is Option #3: A countertop.
In geometric terms, a plane is a flat, two-dimensional surface that extends infinitely in all directions. While a countertop is not infinite, it is a flat surface that serves as a practical example of a plane in a three-dimensional space.
Option #1 (a location on a map) represents a point, not a plane, and Option #2 (a room in a house) is a three-dimensional space rather than a two-dimensional surface.
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