Which of the following makes sales possible without a sales attendant ?

A vending machine makes sales possible without a sales attendant. Vending machines are automated machines that dispense items such as snacks, beverages, cigarettes, and even tickets without the need for a sales attendant. Customers can use cash or a credit/debit card to purchase items from the vending machine, which then dispenses the product. The other options listed, such as telex machine, fax machine, and franking machine, are not used for sales transactions but for communication or postage purposes.