The function f:R rightarrow R defined as...

The function `f:R rightarrow R` defined as `f(x)=(x^2-x-21)(x^2-x-39)`, which of the following is (are) correct?
A) Neither injective nor surjective
B) Minimum value of f(x) is -81
C) f(x)=0 has 4 real and distinct roots
D) f(x) is an even function

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