Your team lead has assigned you the task of learning AWS CloudFormation, a service that allows you to create and manage a collection of related AWS resources and provision them in an organized and predictable manner. To enhance the robustness of your CloudFormation templates, you decide to use AWS-specific parameter types to validate input values and catch errors early in the deployment process.

Considering the various AWS-specific parameter types available, which of the following is NOT a valid parameter type?