Explanation:

- Promissory Note:

- It is an unconditional promise in writing by one party (the maker) to pay a certain sum to another party (the payee).

- The drawer is not a creditor and debtor simultaneously; the maker is only a debtor to the payee.

- Bill of Exchange:

- It is an instrument in writing containing an unconditional order, signed by the drawer, directing a certain person to pay a certain sum to the bearer.

- The drawer can be both a debtor to one party and a creditor to another.

- Cheque:

- Similar to a bill of exchange, but specifically drawn on a bank.

- The drawer is not both a creditor and debtor in the standard sense.

- None of the above:

- Not applicable, as the other options cover relevant financial instruments.

Correct Answer: Bill of Exchange