ball crossing third base

[HM1 Hammonds]

A ball that is hit foul and then bounds over third base is fair?
1) If the ball is hit into foul territory and comes back into fair territory it is foul....
2) If the ball is hit into fair territory and it rolls over the base bag into foul territor it is fair.....
3) If the ball is hit into fair territory, strikes the edge of the bag and goes into foul territory it is foul ...