B. Configure a web override rating for download.com and select Malicious...
D. Configure a static URL filter entry for download.com with Type and Action...
FortiGate Security 7.2 Study Guide (p.268-269):
"If you want to make an exception, for example, rather than unblock access to a potentially unwanted category, change the website to an allowed category. You can also do the reverse. You can block a website that belongs to an allowed category."
"Static URL filtering is another web filter feature. Configured URLs in the URL filter are checked against the visited websites. If a match is found, the configured action is taken. URL filtering has the same patterns as static domain filtering: simple, regular expressions, and wildcard."
A. Configure a separate firewall policy with action Deny and an FQDN address object for *.download.com... (incorrect because you still allow root domain)
Download study guide:
https://ebin.pub/fortinet-fortigate-security-study-guide-for-fortios-72.html