Under Bahrain Civil Aviation Regulations (CARs) and the Bahrain AIP, under what conditions may a Visual Flight Rules (VFR) flight operate at night within Bahrain FIR?

1. Night VFR is unrestricted in all airspace classes without prior notification
2. Night VFR is strictly prohibited for all civil aircraft under all operational conditions without exception
3. Night VFR is permitted only for single-engine aircraft below 1,000 ft along the coastline
4. Night VFR is subject to prior approval from Bahrain CAA, an ATC clearance, continuous two-way radio communication, and compliance with specified minimum safe altitudes and night VFR rules