In 3d space, two planes will always intersect at a line...unless of course they are the same plane (they coincide).
Because planes are infinite in both directions, there is no end point (as in a ray or segment). So, your answer is neither, planes intersect at a line.
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yes it can because a Ray is a line segment with an arrow at the end.
They are not. A line segment is of finite length whereas a ray is infinitely long.
Line, Ray and segment
A segment has 2 endpoints. A ray has only 1 endpoint, where the other end is an infinite line.
It is called a bisector.