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If `f:R rarr R` and `g : R rarr R` are defined by `f(x) = 3x + 2` and `g(x) = x^2 - 3`, then the value of x such that `g(f(x))=4` are

A

a.`-1/3, 1`

B

b.`-1/3, -1`

C

c.1/3, -1

D

d.1/3, 1

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