URL to a web service: Environment variables are the standard Power Platform component for storing application configuration data that varies across environments (e.g., Development, Test, Production). Using an environment variable for the web service URL ensures the solution references the correct endpoint in each deployment without requiring code modifications.

Blocked file types: This configuration refers to the platform-level restriction on allowed file extensions (e.g., blocking .exe or .bat files), which is natively managed in the System Settings (specifically the General tab of the System Settings dialog, stored in the Organization table). In the context of this exam, Solution system settings represents the configuration of these organization-level rules to ensure the business process enforces consistent security constraints wherever it is deployed.

Microsoft Learn - Environment variables overview

Content: "Environment variables allow for parameterization of input data... storing configuration data that varies across environments." "A very common scenario is to store a URL... so that the application connects to the correct service in each environment."

Source: https://learn.microsoft.com/en-us/power-apps/maker/data-platform/environmentvariables

Microsoft Learn - System Settings dialog box - General tab

Content: Documents the specific setting "Set blocked file extensions for attachments" which controls the "Blocked file types" configuration for the environment/organization.

Source: https://learn.microsoft.com/en-us/power-platform/admin/system-settings-dialog-box-general-tab

Microsoft Learn - Solution concepts

Content: Discusses solution components and the management of application behavior across environments.

Source: https://learn.microsoft.com/en-us/power-platform/alm/solution-concepts-alm