When a user wants to utilize their existing per-socket, per-core, or per-virtual machine software licenses for a Microsoft Windows server running on AWS, which Amazon EC2 instance type is required?

Explanations:

Spot Instances are a cost-effective option for running instances on AWS but do not support the use of existing software licenses, as they are ephemeral and can be terminated by AWS.

Dedicated Instances run on physical hardware that is dedicated to a single customer, but they do not provide the necessary visibility and control over the physical host required to use existing licenses.

Dedicated Hosts provide physical servers fully dedicated to a single customer. They allow users to use existing per-socket, per-core, or per-virtual machine software licenses for Windows Server, as they provide the necessary control and visibility over the underlying hardware.

Reserved Instances provide a discount on instance usage over a specified term but do not affect the licensing model. They do not enable the use of existing software licenses as Dedicated Hosts do.