Consider the following propositions:
1. A Muslim woman, on her husband's death, need not follow Iddat if her marriage is valid but not consummated.
2. A Muslim woman, on divorce, need not follow Iddat if her marriage is valid but not consummated.
3. A Muslim woman, on divorce, has to observe Iddat if her marriage is irregular but consummated.
4. A Muslim woman, whose marriage is void but consummated, has to observe Iddat till delivery if she is carrying the child in her womb in case of her husband's death.
Choose the correct option from below: