The management of Vencura Inc. approves the purchase of a few computers for the sales team. The management wants only the most basic functions in the computers, such as managing the file system, reading programs and data into main memory, and allocating system memory among various tasks to avoid conflicts. In this scenario, which of the following categories of software does Vencura Inc. require?

System software

Copylefted software

Applications software

Antivirus software