It is in your best interest to hire the best person for the job, but if you determine who is "best" based on inclusion or exclusion from a protected class then you are illegally discriminating (except for in some specific cases such as the sex and race of actors, and where disabilities can not be reasonably accommodated for).
[0] https://www.ourdocuments.gov/doc.php?flash=true&doc=97&page=...
[0] https://www.archives.gov/eeo/terminology.html
It's the term used to denote the groups protected by a number of different laws, the individual laws describe the classes specifically. This is all well established law and terminology, and anyone who takes part in any hiring process in the US should be versed in all of this.
You're being intentionally obtuse.
And, as a business owner, please tell me why it would not be in my best interest to hire the best person for the job?