Perfect Square

Which of the following is a perfect square?

A. 98!×99!98!\times99!

B. 99!×100!99!\times100!

C. 98!×100!98!\times100!

D. 100!×101!100!\times101!

E. 99!×101!99!\times101!

Notation: ! Is a factorial notation, for example, 3!=3×2×13! = 3\times 2\times 1

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