For each of the pairs of sets, determine whether the first is a subset of the second, the second is the subset of the first, or neither is the subset of the other. Enter "first", "second", or "neither". (a) the set of real numbers, the set of integers (b) the set of bit strings, the set of bit strings which begin with 0 bit. (c) the solution set of the equation x2-4=0, the set N