If the equation x^(2) + 12 + 3 sin (a + ...

If the equation `x^(2) + 12 + 3 sin (a + bx) + 6x = 0 ` has at least one real solution, when `a, b in [0, 2 pi]` , then the value of a = 3b is `(n in Z)`

A

`2 n pi`

B

`(2 n + 1) pi`

C

`(4 n - 1) (pi)/(2)`

D

`(4 n + ) (pi)/(2)`

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The correct Answer is:

C

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