The equation 4x^2 + 12xy + 9y^2 + 2gx + ...

The equation `4x^2 + 12xy + 9y^2 + 2gx + 2fy + c =0` will represents
two real parallel straight lines. if

A

(a) `g=4, f=9, c=0`

B

(b) `g=2,f=9,c=1`

C

(c) `g=2,f=3,c` is any number

D

(d) `g=4,f=9,cgt1`

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The correct Answer is:

C

NA

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