A point.
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No. It can be the whole line.
In most cases, in a single point. It is also possible that there is no intersection, or that the intersection is the entire line.
Two parallel lines, a plane and a line in a plane parallel to it.
the A plane is intersect the plane B It's a line.
Zero (if the line is parallel to the plane), one (generally), or an infinite number (if the line is within the plane).