5. רבי נתן suggests regarding the previous case that: a) the father alone can be מפר the נדר even if she remarries that day. b) the father can only be מפר the נדר alone if she does not remarry on that day. c) בית שמאי holds the father alone can be מפר, and בית הלל holds the new husband must join with the father to be מפר. d) בית שמאי holds the father can be מפר alone, and בית הלל holds that no one can be מפר