Explanation:

The question, though slightly awkwardly phrased, asks for the type of software used by a computer for specific 'work' or tasks. 'Application software' is designed to perform specific tasks for the end-user, such as word processing, web browsing, graphic design, or data analysis. It directly enables users to accomplish their work. 'System software' manages and controls the computer hardware and provides a platform for application software. A 'Program' is a general term for a set of instructions, and an application is a type of program. A 'Package' typically refers to a collection of related software. Given the options, 'Application' software is the most fitting description for software used for 'work' by a user on a computer.