A Florida applicant asks for the exact total fee to add the S endorsement. What is the most accurate official-source answer?

1. FLHSMV lists a $7 endorsement fee, but the total transaction can vary with CDL issuance, school board CDL status, and tax collector service fees
2. The School Bus endorsement is always free in Florida
3. Every applicant pays exactly $48 total
4. The fee is set by the driver's school district and never by FLHSMV