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If one of the lines represented by the equation `ax^2+2hxy+by^2=0` is coincident with one of the lines represented by `a'x^2+2h'xy+b'y^2=0` , then

A

`(ab'+a'b)^(2)=4(ah'-a'h)(hb'-h'b)`

B

`(ab'+a'b)^(2)=4(ah'-a'h)(hb'-h'b)`

C

`(ab'-a'b)^(2)=(ah'-a'h)(hb'-h'b)`

D

`(a'b'-ab)^(2)=(ah-a'h')(hb-h'b')`

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