Which of the following does not constitute an express warranty? "This computer system is accessible by a PB2400 modem." "This computer system is IBM-compatible." "This computer system has a built-in battery back-up system that gives you two minutes to save files in the event of a power interruption." All of the above are express warranties.

All of the above are express warranties

Explanation:

An express warranty refers to an agreement by a vendor to carry out repair works or a replace a faulty component in a product, or service within a particular period of time following when it was purchased. Product Buyers rely on these guarantees or promises and sometimes are encouraged to purchase items because of the agreement.

All of the above are express warranties

Explanation:

Express warranty: This is a product guarantee that is provided to a customer or buyer against any damages or malfunction of the product within a specified   period of time. This guarantee could cover replacement or repair of the product. Most product that are been purchase are always covered under warranty.

All the statements mentioned constitute an express warranty because they all ascertained that the products are effectively performing the purpose for which they were meant for. When a guarantee is given on a product but it could not effectively perform the purpose for which it is meant for, then it is an Implied warranty.