What are the different types of instances?

The correct answer is: D. all of the above

Amazon EC2 provides a variety of instance types to meet your needs. You can choose from general purpose, compute optimized, memory optimized, storage optimized, and accelerated computing instances.

• General purpose instances are a good choice for a wide range of workloads, including web servers, application servers, and databases.
• Compute optimized instances are designed for workloads that require a lot of CPU power, such as high-performance computing (HPC) and video rendering.
• Memory optimized instances are designed for workloads that require a lot of memory, such as in-memory databases and big data analytics.
• Storage optimized instances are designed for workloads that require a lot of storage, such as data warehouses and content delivery networks.
• Accelerated computing instances are designed for workloads that require specialized hardware, such as graphics processing units (GPUs) or field-programmable gate arrays (FPGAs).

You can also choose from different tenancy options, which determine how your instance shares resources with other instances on the same physical host. The three tenancy options are:

• Shared tenancy instances are the most cost-effective option, but they also have the least amount of control over your instance’s resources.
• Dedicated tenancy instances are isolated from other instances on the same physical host, which gives you more control over your instance’s resources.
• Spot instances are available at a much lower price than on-demand instances, but they can be terminated if Amazon needs the resources for other workloads.

For more information on Amazon EC2 instance types, tenancy options, and pricing, please visit the Amazon EC2 website.