Concept:Credit instruments are written documents that acknowledge a debt or obligation to pay money.
Explanation:They include banknotes, bank drafts, bills of exchange, government bonds, and promissory notes.
Bills of exchange and promissory notes are common examples used in commerce.
Items like billboards, postal stamps, payment vouchers, and salary vouchers are not credit instruments.
Therefore, the correct pair from the options is bills of exchange and promissory notes.
Answer:D. bills of exchange and promissory notes