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Suppose that we are using infinite bit vectors to represent subsets of the natural numbers, using the same notational conventions as in the textbook. Then a finite subset of the natural numbers would be represented by (a) A bit vector of infinite length which contains only finitely many ones. (b) A bit vector of infinite length which contains only finitely many zeros. (c) A bit vector of finite length ОО (d) An itty bitty vector of infinitesimal length