Countifs - Ignoring irrelevant data

Hi,

I may be struggling with a first day back at work brain but I'm struggling to think of how to structure a formula.

What I need to do (Using the example attached) is count all the CAT3s but only from sites A,B and C. I need it to ignore D,E and F.

If I was doing it for a single site then it would just be

=COUNTIFS(B3:B25,"Site A",C3:C25,"CAT3")

But I want to widen the criteria in column B but ignore parts thereof.

This is just test example data and part of a larger formula but I'm struggling at the first part!

Thanks, the first part worked a treat and I was able to include it the rest of the formula to work fine.