Task: Question Answering
Input (English): The function f is defined by \(f(x) = a (x - b)2 + k\) for all real \(x\), where \(a\), \(b\), and \(k\) are constants. If \(a\) and \(k\) are negative, which of the following CANNOT be true?
(A)\(f(5) = -3\) (B)\(f(0) = -5\) (C)\(f(2) = 4\) (D)\(f(1) = k\) (E)\(f(-2) = b\)
Output (English): C