Explanation:

- Option 1: A confession by a girl engaged to the accused typically doesn't fall under the legal exceptions often considered in court, such as privilege or spontaneous admissions. It doesn't usually meet the criteria for certain defenses like provocation.

- Option 2: A confession of adultery is generally recognized as a form of grave and sudden provocation, which might be used as a defense in legal contexts, particularly as it can strongly affect emotions and reactions.

- Option 3: Both options (a) and (b) are considered, implying the presence of both the lack of exception for engaged confessions and the recognition of provocation in adultery confessions.

- Option 4: Suggests neither of the first two statements is correct.

- Correct Answer: Option 3 is correct as it addresses two distinct legal concepts effectively.