Which of the following instance class is best used for applications that are processor or compute-intensive?

The correct answer is C. high cpu instances.

High CPU instances are designed for applications that require a lot of processing power. They have a higher number of vCPUs and a higher clock speed than standard instances. This makes them ideal for applications such as video rendering, machine learning, and scientific computing.

Standard instances are a

good choice for applications that do not require a lot of processing power. They have a lower number of vCPUs and a lower clock speed than high CPU instances. This makes them more cost-effective for applications that do not need a lot of processing power.

High memory instances are

designed for applications that require a lot of memory. They have a higher amount of memory than standard instances. This makes them ideal for applications such as databases, in-memory analytics, and big data processing.

None of the mentioned is not a valid option.