What is the relationship between 'Qantas' and 'Alan Joyce' in the context of the input sentence.
Options: owner of, location of formation, chief executive officer, industry

Other senior boofs in the audience included Qantas boss Alan Joyce , ASX chief Elmer Funke Kupper​ , Rio Tinto's executive Greg Lilleyman , Telstra's Andy Penn , and former Treasury secretary Martin Parkinson .
chief executive officer