Finding how many filtered ports of a host that would be listed as “filtered” on Nmap

I just started working on nmap and was confused by this question. I’m unsure if I understood it correctly, so I appreciate your help with this.

Using Nmap, find how many ports are filtered in testphp.vulnweb.com are displayed as “filtered.”

From my understanding, it was asking me to find filtered ports that would be displayed as filtered. If i want to find how many filtered ports of a host that would be listed as “filtered”, would I use the -sA command for the firewall or is there a way to do that? I’ve tried -d2 but only found ALL filtered ports.

Please let me know if I’m overthinking it or the question should be interpreted differently. Thank you in advance!