An administrator needs to build a VM for a legacy, single-threaded application. According to best practice, how many virtual CPUs should the administrator use?

A single-threaded application is designed to execute instructions sequentially on a single processor core at any given moment. Assigning more than one virtual CPU would result in the additional vCPUs remaining idle and potentially increasing hypervisor scheduling overhead without providing any performance benefit to the application.

Assigning 2 vCPUs to a single-threaded application would result in one vCPU remaining idle, wasting resources and potentially adding unnecessary scheduling complexity for the hypervisor.

Assigning 4 vCPUs to a single-threaded application would result in three vCPUs remaining idle, leading to significant resource waste and potential performance degradation from hypervisor overhead.

Assigning 8 vCPUs to a single-threaded application is highly inefficient, as seven vCPUs would be unused, consuming host resources and incurring avoidable hypervisor scheduling penalties.