Determine whether the relation R on the set of all people is reflexive, symmetric, antisymmetric, and/or transitive, where (a, b) ∈ R if and only if a) a is taller than b. b) a and b were born on the same day. c) a has the same first name as b. d) a and b have a common grandparent.

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Question ID: mtid-5-stid-8-sqid-823-qpid-708