Utilize the input text as a context reference, choose the right relationship between Elon Musk and chief executive officer from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Reaching the initial target may be a stretch because some interior suppliers might not be able to increase the flow of high-quality parts fast enough to meet the Model X production plan, chief executive officer Elon Musk said on a conference call with analysts.

Answer: position_held