Product of Roots = Root of Product?

Algebra Level 2

Which of the following is false?

A. 9×4=36\sqrt{9}\times\sqrt{4} = \sqrt{36}

B. 9×4=36\sqrt{9}\times\sqrt{-4} = \sqrt{-36}

C. 9×4=36\sqrt{-9}\times\sqrt{-4} = \sqrt{36}

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