The employer mandate of the PPACA requires that:

A$.$ every firm must purchase health insurance for their full$-$time employees or pay a $$2,000$ fine per employee.

B$.$ every firm with $50$ or more full$-$time employees must purchase health insurance for their full time employees or pay a $$2,000$ fine per employee.

C$.$ every firm with fewer than $50$ full$-$time employees must purchase health insurance for their full$-$time employees or pay a $$2,000$ fine per employee.

D$.$ every firm with $500$ or more employees must establish their own on$-$site medical facilities to provide employees with basic medical care.