$\mathbb{R} \times \mathbb{R}$ represents:
Athe real line
Bthe coordinates of all points in the plane
Cthe empty set
Dall triples $(x, y, z)$
Answer & Solution
Correct answer: B. the coordinates of all points in the plane
$\mathbb{R} \times \mathbb{R} = \{(x, y) : x, y \in \mathbb{R}\}$ — all ordered pairs of reals, i.e., all points of the Cartesian plane.
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