InSettings > Wi-Fi, tapping a network’s info (i) shows theAuto-Jointoggle. Disabling it prevents the iPhone from automatically connecting to that network, even if previously joined.
Option A: Ask to Join Networks prompts for new networks, not known ones.
Option B: Auto-Link isn’t an iOS setting.
Option C: Preferred Networks isn’t a toggleable option.
Option D: Correct—controls auto-connection.References: Apple Support - "Join a Wi-Fi network on iPhone" (support.apple.com/HT202831).
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