If the line 4x-3y+k=0 touches the ellips...

If the line `4x-3y+k=0` touches the ellipse `5x^2+9y^2=45` then the value of k is

A

`+ 21`

B

`pm 3 sqrt(21)`

C

`+3`

D

`+3 (21)`

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The correct Answer is:

B

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