The Google Play Developer Console is used to upload which type of apps that can be marked as private and set to be available only to specific enterprises? Select the correct answer, then submit.

Custom apps, also known as private apps, are developed specifically for an organization's internal use and can be uploaded to the Google Play Developer Console. These apps are marked as private and are only visible and installable by users within the designated enterprise, ensuring that proprietary applications remain secure and accessible only to the intended audience. Sandboxed, Enterprise, and Secure are not official app types or classifications within the Google Play Developer Console for this specific purpose.