In which of the following systems is ECC RAM most commonly used?

Error-Correcting Code RAM is most commonly installed in servers because these systems require high reliability, data integrity, and continuous operation. ECC memory can detect and automatically correct certain memory errors, particularly single-bit errors, before they cause corrupted data, application failures, or system crashes. This capability is important for file servers, database servers, virtualization hosts, and other systems that process business-critical information. Standard laptops, mobile phones, and game consoles generally use non-ECC memory because it is less expensive, uses simpler memory controllers, and provides sufficient reliability for consumer workloads. Some specialised mobile workstations may support ECC memory, but they are exceptions rather than the typical laptop configuration. Server-class motherboards and processors are specifically designed to support ECC functionality, making a server the most appropriate answer among the available choices.