The diagonals of the parallelogram whose...

The diagonals of the parallelogram whose sides are `lx+my+n = 0`,`lx+ my+ n',=0`, `mx+ly+n=0`, `mx+ly+n'=0` include an angle

A

`pi/3`

B

`pi/2`

C

`tan^(-1)((l^2-m^2)/(l^2+m^2))`

D

`tan^(-1)((2lm)/(l^2+m^2))`

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The correct Answer is:

B

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