Explanation:

- Option 1: A statute can exclude that element.

- Sometimes, laws specifically state that a crime doesn't require mens rea. This means the law excludes the need for a guilty mind.

- Option 2: Mens Rea is an essential ingredient of criminal offence.

- Generally, a guilty mind is necessary to establish most crimes. It's a key component that determines if someone has committed a crime with intent or knowledge.

- Option 3: Both (a) and (b).

- Both statements are true. Mens rea is typically required, but laws can remove this requirement.

- Option 4: None of the above.

- This option would only be valid if neither statement was correct.

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