William owns a hair salon downtown and is very busy most days. Last year he made close to $$2$ million in sales. A federal agency has recently contacted him to discuss how his business is categorized. Based on the specifics of his business, which agency is most likely contacting him?

The Agricultural Administration $($AA$)$

The Internal Revenue Service $($IRS$)$

The Small Business Administration $($SBA$)$

The Large Firm Agency $($LFA$)$