Assume that x is the standard deviation of the set of the nonzero numbers {a, b, c, d, e} For each of the following sets, indicate which sets must have a standard deviation equal to x. Set: {a 2, b 2, c 2, d 2, e 2} {a-2, b-2, c-2, d-2, e-2} {2a, 2b, 2c, 2d, 2e} {a/2, b/2, c/2, d/2, e/2}