题目：Computer software, or just software is a general term used to describe a collection of computer programs, procedures and documentation that perform some tasks on a computer system.The term includes:
- A. Middleware which controls and co-ordinates distributed systems.
- B. Application software such as word processors which perform productive tasks for users.
- C. Firmware which is software programmed resident to electrically programmable memory devices on board mainboards or other types of integrated hardware carriers.
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