Apple supports two standard manual methods for updating iOS or iPadOS. Directly on the device, open Settings > General > Software Update and download and install the available update, making option B correct. A user can also connect the iPhone or iPad to a trusted Mac running macOS Catalina or later, select the device in Finder, choose General, and select Check for Update, making option C correct. There is no separate iOS or iPadOS Update application, and operating-system updates are not initiated from the App Store. Another iPhone or iPad cannot function as the update host in the manner described in option D. Finder provides the supported computer-based update path when a wireless update is unavailable or when updating through a Mac is preferred.
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