Which concise statement correctly distinguishes a mob from a riot?

A mob is highly emotional with a clear target or goal; a riot is highly emotional but disorganized and lacks a clear goal.

A mob is always lawful and orderly with explicit institutional oversight, while a riot is an example of a conventional crowd organized through formal channels.

Mobs and riots are identical in definition and there is no sociological distinction between targeted violence and disorganized group activity.

A riot is defined by the presence of a democratic assembly engaged in formal negotiation, whereas a mob is always a scheduled celebratory gathering.