Under ICAO Annex 11, what is the rule regarding taxiing aircraft crossing an inactive runway during ground movement?

1. An aircraft must NEVER cross any runway (active or inactive) without receiving an explicit, individual clearance from ATC to cross that specific runway (e.g., 'CROSS RUNWAY 27 AT TAXIWAY DELTA').
2. Aircraft may cross any inactive runway at the pilot's discretion without ATC clearance.
3. Aircraft can cross inactive runways as long as taxi lights are turned off.
4. Ground controllers cannot issue runway crossing clearances.