The number 81 is the coefficient of x ^(...

The number 81 is the coefficient of `x ^(k)` in the binomial expansion of `(x ^(2) + (3)/(x)) ^(4), x ne 0.` Then the value of k equals

A

a) `-2`

B

b) `2`

C

c) `-4`

D

d) `4`

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