Occupying Free throw Spaces

[NewNCref]

Team B MUST occupy the first lane space above the block. Team A MAY occupy the second lane spaces. Team B MAY occupy the third and final marked lane spaces.

I only have my 07-08 rule book on hand, but it should be the same rule citation. Rule 8-1-4(e) says players may move along and across the lane to occupy a vacant space within the above limitation. Team B may have up to four (and at least two) players lined up on the lane. Team A may have up to two (or none, if they so choose).

Now, if A1 already had the ball at his disposal, the Team B players could not move, as doing so would constitute a violation.