Question: In Data Flow Diagramming, for a data flow to be valid it must follow three rules. What are the 3 rules for a data flow?

In Data Flow Diagramming, for a data flow to be valid it must follow three rules. What are the 3 rules for a data flow?
B
I,U,T2,T2,Ix
In Data Flow Diagramming, for a data flow to be valid

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