The negation of the statement "For every real number $x$,$x^2+5$ is positive" is
- AFor every real number $x$,$x^2+5$ is not positive.
- BFor every real number $x$,$x^2+5$ is negative.
- CThere exists at least one real number $x$,such that $x^2+5$ is not positive.
- DThere exists at least one real number $x$,such that $x^2+5$ is positive.
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