How do car manufactures decide what car gets what options?

So today this random question has been on my mind. 3 of my friends and myself all have 2014 Ford Focus' and all are the SE model. Mine has a few extra features though. Sunroof, leather heated seats and spoiler. How do the manufactures pick which car has a different option then the next?

A few individual with MBA in business and marketing.

The dealer ORDERS cars to fill inventory. They decide what packages/options the cars will have.

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