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B One Machinery can only be in one Job. Jobs can have multiple machinery. It is not many to many. One Job (parent) can have multiple Machinery (child). Machinery (child) can only have one Job (parent). It's a lookup on Machinery
C is correct
One job can have many pieces of machinery and while machine can only be on one job at any given time, but we want to track dates and costs, so we can't discard the historical data when moving the machine to a new job.