Under Article 65 of the driving-licence Provisions as amended by MPS Order 172, what happens to a commercial passenger bus driver on reaching the statutory upper age for large and medium passenger vehicles?

1. At 63 they may apply, in the preceding year, to extend the category for up to three more years after passing memory, judgement and reaction tests; otherwise they exchange the A1/A3/B1 licence for Class C1 or C2 within 30 days
2. At 60 they must exchange the A1/A3/B1 licence for a Class C1 or C2 licence within 30 days, with no possibility of extension
3. Their driving licence is cancelled outright and they may no longer drive any motor vehicle
4. They may keep the licence but are restricted to long-distance sleeper coach routes only