Which of the following statements is incorrect?
(A) The sum of two monotonically increasing functions is also monotonically
(B) The product of two monotonically increasing functions is also monotonically
(C) $f\left( x \right)=\sqrt x $ is monotonically increasing
(D) If a function is monotonically increasing, it must be invertible.
(E) If a function is monotonically decreasing, it must be invertible.
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