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The locus of a point which moves in a plane so that the sum of the squares of its distances from the lines \( a x+b y+c=0 \) and \( b x-a y+d=0 \) is \( r^{2} \), is a circle of radius.
(a) \( r \sqrt{\left(a^{2}+b^{2}\right)} \)
(b) \( r \)
(c) \( r \sqrt{a^{2}-b^{2}} \)
(d) \( 2 r \)
(W)
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