Which of the following is the MINIMUM number of power supplies with which most blade servers normally come?

A single power supply creates a single point of failure, which is incompatible with the high-availability design goals of blade server platforms.

Blade servers are enterprise-class systems built for high availability, and dual power supplies are the standard minimum configuration to eliminate a single point of failure at the power delivery level. With two PSUs, the server can operate in N+1 redundancy mode, where one supply can fail without causing downtime. This is consistent with vendor designs from HPE, Dell, and Cisco for blade chassis and individual blades.

Three power supplies exceed the minimum required for basic redundancy and represent a higher-tier configuration, not the baseline minimum.

Four power supplies are found in high-end configurations requiring greater fault tolerance or power capacity, well above the minimum standard.