For a positive integer n ≥ 4, let {0, 1]" denote the set of all binary strings of length n. The relation R in { 0, 1 }" contains all pairs of binary strings (s, t) such that the leftmost digit in s coincides with the leftmost digit in t and the rightmost digit in s coincides with the rightmost digit in t. Indicate the correct statement. OR is an equivalence relation that partitions {0, 1}" into equivalence classes of cardinality 2-4 OR is not an equivalence relation. OR is an equivalence relation that partitions {0, 1}" into 2n-2 equivalence classes. OR is an equivalence relation that partitions {0, 13" into 4 equivalence classes. O None of these. OR is an equivalence relation that partitions {0, 1}" into equivalence classes of cardinality 4.

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