Task: Question Answering
Input (English): If \(\sqrt { a^2 + b^2 } = a + b\), which of the following must be true?
(A)\(a = 0\) and \(b = 0\) (B)\(a + b = 0\) (C)\(ab = 0\) (D)\(ab \neq 0\) (E)\(a^2 - b^2 = 0\)
Output (English): C