A cleaner at the KK International Airport found a diamond ring in the corner of a disused toilet room. The International Airport is managed by KK Airport Authority. There is now a dispute as to who should have possession of the ring. Advise accordingly.
a) The cleaner, as they found the ring in the course of their duties.
b) The Airport Authority, as they own and manage the premises.
c) The owner of the ring, if they can provide proof of ownership.
d) The police, to handle the dispute according to local laws and regulations.