Late Game Situation

[A Pennsylvania Coach]

Saw this in a televised game officiated by our chapter:

Team A up by 9 in closing seconds. B1 takes a halfcourt shot and is fouled in the act by A1. After the foul the clock continues to run and the horn sounds. The clock shows 0:00. What do you do if (a) you know how much time was left at the time of the foul, and it was 1.5 seconds?; (b) you know how much time was left at the time of the foul, and it was 0.5 seconds?; (c) you don't know how much time was left at the time of the foul?