What is a$$ "promissory note"?

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Part $1$

A$.$

A$$ short$-$term highly liquid investment that is readily convertible to known amounts of cash.

B$.$

A written promise to repay for the goods purchased under regular business terms and conditions.

C$.$

A verbal promise to repay a specified amount at a specified date.

D$.$

A written promise to repay a specified amount at a specified date.