the solution set of x^2-4x - 21 ge ...

the solution set of ` x^2-4x - 21 ge 0` is

A

`(-1,4)`

B

`(-oo,-3]uu [7,oo)`

C

`(-oo,3) cup (5,oo)`

D

`[-4,1]`

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The correct Answer is:

B

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