Explanation:

- Cheque: A cheque is a negotiable instrument that orders a bank to pay a specific amount from a person's account to the person named on the cheque.

- Bill of Exchange: This is a written, unconditional order by one party to another, requiring the party to pay a specified sum to a third party at a given time.

- Currency Note: While currency notes are legal tender and facilitate transactions, they are not considered negotiable instruments under the Act.

- Promissory Note: This is a written promise by one person to pay another a definite sum of money, either on demand or at a future date.

Correct Answer: Option 3 - Currency Note is not a negotiable instrument as per the Act.