_____ are new releases of an app and may require an additional fee before you can install them.

A) Service Packs
B) Patches
C) Upgrades
D) Restorers

Upgrades are new releases of an app that usually come with additional features and improvements. They may require an additional fee before installation. Service Packs and Patches usually refer to updates that fix bugs and security issues but are usually free. Restorers are tools that help to restore a system to a previous state, but they are not related to app updates.