If \(\sqrt { x + p } = \sqrt { x - q } \), which of the following could be true? I. \(p = 0\) and \(q = 0\) II. \(pq = 0\) III. \(p + q = 0\)
(A)I only (B)II only (C)III only (D)I and III only (E)II and III only
D