The Group Policy Object (GPO) applied to Server1 enforces the "Configure App Install Control" setting with the value "Allow apps from the Store only". This policy leverages Windows Defender SmartScreen to restrict application installations to only those sourced from the official Microsoft Store. Consequently, App1, which originates from the Microsoft Store, is permitted. App2 (from the Internet) and App3 (from a network share) are from sources other than the Microsoft Store and will be blocked by this policy.

B. App1 and App2 only: Incorrect. App2 is sourced from the internet, which is not the Microsoft Store, and will be blocked by the "Allow apps from the Store only" policy.

C. App1 and App3 only: Incorrect. App3 is sourced from a network share, which is not the Microsoft Store, and will be blocked by the "Allow apps from the Store only" policy.

D. App1, App2, and App3: Incorrect. The policy explicitly restricts installations to the Microsoft Store, therefore blocking App2 and App3.

1. Microsoft Learn. (2023). Manage app installation with Group Policy. This document details the "Configure App Install Control" Group Policy setting. It specifies that selecting "Allow apps from the Store only" restricts users to installing apps exclusively from the Microsoft Store.

Section: "Manage app installation with Group Policy"

Reference: The article describes the policy path Computer Configuration > Administrative Templates > Windows Components > Windows Defender SmartScreen > Explorer and the behavior of the "Allow apps from the Store only" option.

2. Microsoft Learn. (2023). Policy CSP - SmartScreen. This document describes the Mobile Device Management (MDM) policy equivalent to the GPO setting. The SmartScreenAppInstallControl policy with a value of msstore enforces the same restriction.

Section: "SmartScreenAppInstallControl"

Reference: The description for the msstore value states

"Allow apps from the Store only." This confirms the intended behavior of blocking apps from other sources like the internet or local shares.

3. Microsoft Learn. (2023). Windows Defender SmartScreen overview. This document provides context on how SmartScreen works to protect systems.

Section: "How Windows Defender SmartScreen helps to protect you"

Reference: The document explains that SmartScreen checks files downloaded from the internet against a list of reported malicious software sites and programs

and the "App Install Control" feature is an extension of this protection to control installation sources.