Final answer:
The best practice for securing a home computer is to install and maintain an updated firewall, use strong, unpredictable passwords, and regularly update anti-virus software. Being cautious with emails from unknown senders also contributes to better security.
Step-by-step explanation:
The best practice for securing your home computer is option d) Installing a firewall and keeping it up to date. Having a robust firewall acts as a barrier between your computer and unauthorized access, preventing potential cyber threats. Additionally, it's crucial to use passwords and PINs that cannot be easily guessed to further protect your computer. Regular updates of anti-virus software are necessary, because they ensure your system can recognize and protect against the latest malware and security threats. You should always be cautious when handling emails from unknown senders to protect your digital information, as clicking on links or opening attachments can lead to security breaches.