Answer:
D. All of the above.
Step-by-step explanation:
To make a computer the most secure, it's recommended to install an anti-virus software, turn on Windows automatic updates, and install a firewall.
However, modern Windows computers come preinstall with Windows Defender which includes anti-virus and firewall and auto updates are ON by default. And E. None of the above can be correct.
However, it's asking for more secure, no other answer is more secure than D) All of the above.