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Set Theoryhard
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For each real number r∈Rr \in \mathbb{R}r∈R, define the set of points in the Cartesian plane: Sr={(x,y)∈R2:y=r(x2−1)}S_r = \{ (x, y) \in \mathbb{R}^2 : y = r(x^2 - 1) \}Sr​={(x,y)∈R2:y=r(x2−1)} Which of the following describes the intersection ⋂r∈RSr\bigcap_{r \in \mathbb{R}} S_r⋂r∈R​Sr​?