Mobile Operating Systems

Correct Answer: Clear cache and uninstall unnecessary apps

The best solution to resolve insufficient storage and allow the user to download the desired app is to clear cache and uninstall unnecessary apps. This will free up storage space on the device without impacting essential functionality. Performing a complete device reboot will not address the underlying storage issue. Disabling device encryption, while potentially freeing up some space, compromises security and is not recommended. Updating device software does not directly resolve storage problems and may in fact require additional free space to complete.

Correct Answer: Check running background apps and reduce screen brightness

Checking running background apps and reducing screen brightness are effective ways to reduce battery drain on a mobile device. Background apps can consume significant battery even when not actively used, so closing unnecessary apps helps conserve power. Lowering screen brightness also reduces the display's power consumption, which is often a major contributor to battery drain. Disabling automatic updates may provide some battery savings by preventing the device from constantly checking for and downloading updates in the background, but it's not as impactful as managing apps and screen brightness. A factory reset is an extreme measure that will likely resolve battery drain if caused by software issues, but it should only be done as a last resort after other troubleshooting, as it erases all data on the device. Removing the battery is not a proper solution, as most modern mobile devices have non-removable batteries, and physically removing the battery could damage the device.

Correct Answer: App permissions

The correct answer is 'App permissions'. This feature in mobile operating systems allows users to control and restrict an app's access to various device resources and functionalities. App permissions are a crucial security feature that gives users granular control over what resources and data an app can access on their device. This includes permissions for accessing the camera, microphone, location, contacts, storage, and other sensitive information or hardware features. 'Resource allocation' is incorrect as it typically refers to the distribution of system resources like CPU, memory, and storage among running processes, not specifically to restricting app access to device features. 'App sandboxing' is a security mechanism that isolates apps from each other and the system, but it doesn't provide user-controlled permissions for specific resources. 'Data encryption' is a method to protect data by converting it into a code, but it doesn't relate to controlling app access to device resources.