Cedric, an IT software support executive working for Panacea Tech. Inc., was asked to install Ubuntu operating system in the computers present in the organization. After installing Ubuntu, he noticed that there are many unnecessary services and packages in the OS that are automatically installed without the user's permission. To make sure that the Ubuntu operating system is more secure, he wants to stop and disable all the unwanted services. In order to stop or disable these unnecessary services or packages from the Ubuntu distributions, which of the following commands should Cedric execute?