Answer: Disable automatic completion of username and passwords or Select the option to delete cookies when you close the browser.
Explanation: The rest aren't safe. If it's a one choice go with Disable automatic completion of username and passwords
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The answer is
SSIDSSID which in full stands for Service
Set Identifier is used to identify a network. It ensures that clients are able
to locate a WLAN in which they are attached to. In Layman’s terms, it’s the
username or the primary name in a WiFi setup in which a user joins and is connected
to.