System+User Mode supports pre- and post-login connectivity. TheApple Platform Deployment Guidestates, "System+User Mode for 802.1X allows a Mac to connect to Wi-Fi using system credentials before login and switches to user credentials after login, ensuring network access at all stages." Option B is not a standard term, C requires login first, and D uses only system credentials.
[References:, Apple Platform Deployment Guide, "802.1X Authentication" section., macOS Deployment Reference, "Network Configuration" section., , ]
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