Which of the following instruments is negotiable?

An instrument that states "payment is to be made at some future time after above date."

An instrument that states "payment is to be made $10$ days after delivery of the goods," but fails to indicate when delivery is to be made.

An instrument that states "this contract was created for the purpose of being transferred."

An instrument that states $"$an payment extension is permissible" and does not state a fixed time for payment.

An instrument that states "payment shall be in shares of stock."