Analyze the relationship between 'TaskRabbit' and 'company' within the context of the input sentence.
Options: original broadcaster, platform, creator, legal form

The sector that encompasses Etsy ETSY, -2.79% HomeAway AWAY, +0.19% Uber and on-demand labor company TaskRabbit is called the sharing economy, based on the idea that these companies share human and physical resources in some way.
legal form