7. The correct answer is (B). The locus of points at distance d from one plane consists of two planes
parallel to the given plane and distance d from it.
The locus of points at distance e from the second plane consists of two planes parallel to the
second plane and at distance e from it.
Since the two original planes are perpendicular to each other, the first pair of planes is perpendicular
to the second pair of planes, resulting in 4 lines of intersection.
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