Find the value of f''(x) if f(x) = x^(1/2).

A) f''(x) = 1/2x^(-1/2)
B) f''(x) = 1/4x^(-3/2)
C) f''(x) = -1/4x^(-3/2)
D) f''(x) = -1/2x^(-1/2)