Which of the following is not a negotiable instrument?

An invoice is not a negotiable instrument. A negotiable instrument is a written document that represents an unconditional promise or order to pay a certain amount of money. These documents are legally binding and can be transferred from one person to another, like cash. Money orders, cheques, promissory notes, and bills of exchange are all examples of negotiable instruments. A money order is a document that orders a specific amount of money to be paid to a particular person or organization. A cheque is an order to pay a specific amount of money from one person or organization to another. A promissory note is a written promise to pay a specific amount of money at a certain time in the future. A bill of exchange is a written order to pay a specific amount of money at a specific time in the future. An invoice, on the other hand, is a document that shows the details of a transaction between a buyer and a seller, including the items purchased, quantities, and prices. It is not an order to pay a specific amount of money and is not transferable to another person. Therefore, an invoice is not a negotiable instrument.