Comprehensive and Detailed In-Depth Explanation: A server room's environment must account for power capacity and circuit breakers to prevent electrical failures. * B. Power distribution unit placement - Important, but circuit breaker capacity is more critical. * C. RAID configurations - Related to data redundancy, not the physical environment. * D. Virtualization - Does not affect server room conditions. Reference: CompTIA A+ 220-1102, Objective 4.2 - Best Practices for Server Room Maintenance