Which action best strengthens online safety through system maintenance and password hygiene?

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Regular system maintenance and strong password hygiene are essential for online safety. Keeping software up to date patches security flaws that attackers could exploit to gain control of devices or steal data, and it helps protect against malware and phishing schemes that target old, unpatched software. Strong passwords improve protection by making it harder for someone to guess or brute-force access to accounts. When you pair updated software with unique, complex passwords (ideally managed with a password manager and secured by multi-factor authentication), you create solid barriers against common attack methods.

The other options weaken safety: sharing passwords breaches personal credential security; posting personal information publicly increases opportunities for identity theft or social engineering; and relying on public Wi-Fi introduces eavesdropping risks on sensitive data.