2009 Redding question

[SNG10]

Thanks.

I'm trying to get to get that whole end of period scoring play penalty enforcement down pat. Would these statements be true? :

1) Fouls during end of period scoring plays (td) can be enforced on the try
or carry over to the next period, except at the end of the 4th.

2) Fouls committed during or after a successful try or fg can carry over to the next period, including overtime, if it happens on the last play of a period.

3) Fouls committed on scoring plays(td) in overtime can be enforced from the try or carry over to the next ot, if committed on the last play of the ot.