If the straight line 3x + 4y = k touche...

If the straight line 3x + 4y = k touches the circle `x^(2) + y^(2) = 16`x , then the values of k are

A

`16 , -64`

B

`16 , 64`

C

`-16 , -64`

D

`-16 , 64`

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