Which of the following is a compute parameter of a cloud server?

The correct choice, the number of CPU, is considered a compute parameter of a cloud server because it directly impacts the processing power and performance of the server. The CPU (Central Processing Unit) is fundamental to executing tasks and running applications, and in cloud environments, it determines how many operations can be carried out simultaneously. This parameter is crucial for understanding the capabilities of a cloud server, especially in environments that require significant computational resources.

In contrast, while other options might relate to different aspects of server architecture or functionality, they do not directly represent compute capacity in the same way the number of CPUs does. For example, the number of hypervisors pertains to virtualization management rather than the server's computational power. The amount of ROM (Read-Only Memory) primarily relates to storage and the state of data rather than real-time processing capacity. The number of hosts refers to the hardware setups that can run virtual machines, which again doesn't directly denote the compute capabilities of a single cloud server. Thus, the number of CPU is the most relevant parameter when discussing compute capacity in a cloud context.