Explanation:

- Option 1: A confession by a girl engaged to the accused doesn't count as a legal exception under typical provisions like provocation or duress. It's merely a declaration without special legal weight.

- Option 2: A wife's confession of adultery to her husband can be considered a sudden and grave provocation. Such cases might reduce the culpability of the husband if he reacts impulsively, as emotional distress can be argued.

- Option 3: Both of the above are considered and discussed separately, thereby providing a broader perspective.

- Option 4: None of the statements accurately reflect legal doctrines or exceptions.

Correct Answer: Option 3: Both (a) and (b).