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Under NCAA rules, all 3 result in a safety. Technically, A and B are illegal and should be flagged, however, the result of the penalty is the same.
The interesting thing is that these fouls have loss of down penalties. So if they occurred on the 1 yard line rather than the end zone on 4th down, Team B could accept the penalty rather than the safety and put the ball in play. This is why the flag needs to be thrown -- to illustrate the foul occurred in the end zone rather than the field of play, in case its close.
On the other hand, don't give the defense a cheap 1 yard line possession. If you can put this in the end zone and give them a safety, do so. If it happens at the 4, there's nothing you can do other than put the flag there.
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