Mashaal Masha
Which of the following is equivalent to the expression $x^{4}-x^{2}-6$?
Difficulty: Medium
A: 

$(x^{2}+1)(x^{2}-6)$

B: 

$(x^{2}+2)(x^{2}-3)$

C: 

$(x^{2}+3)(x^{2}-2)$

D: 

$(x^{2}+6)(x^{2}-1)$

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