Mainframes are high-capacity computers known for their powerful processing speed, extensive data storage, and ability to support hundreds or thousands of simultaneous users. They are typically used by large organizations for mission-critical applications such as bulk data processing, enterprise resource planning, and transaction processing.
Workstations (A) are personal or high-performance single-user computers.
Main computers (B) is not a formal term.
Supercomputers (C) are used for highly complex calculations, not general-purpose multi-user environments.
[References:, , PSP Study Guide – Computer Types and Security Considerations, , ASIS POA Manual – Information Systems and Infrastructure Security]
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