If the combined equation of the diagonal...

If the combined equation of the diagonals of the square formed by the pairs of lines xy + 4x - 5y - 20 = 0 and xy - 5x + 4y - 20 =0 is `x^2-y^2-kx + ly = 0 ` , then k+l =

A

0

B

2

C

`-1`

D

1

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The correct Answer is:

B

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