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Software Performance Testing and Engineering
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A database of personal contacts is best implemented on
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A
A personal computer
💡 Explanation:
A personal contacts database typically has modest scale and single-user access patterns, making a personal computer the most appropriate and cost-effective platform. Mainframes are for enterprise-scale transaction processing, Unix workstations for technical computing, and massively parallel supercomputers for high-performance scientific computing - all overkill for personal contacts.