Operation F means "take the square root," operation G means "multiply by constant c," and operation H means "take the reciprocal." For which value of c is the result of applying the three operations to any positive x the same for all of the possible orders in which the operations are applied?

(A) -1

(B) -½

(C) 0

(D) ½

(E) 1

Is it GMAT type question ? If yes , I need some help in understanding the approach .

thanks in advance .

OAE