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What is the definition of a "concurrent force"?

A A system requiring all systems to pass through the same point
Though the word "concurrent" may imply the need for concurrent movement in different force sources, concurrent merely describes the need for forces to pass through the same point. It does not require simultaneous movement or numerous force sources.
B A force system requiring concurrent movement
C A series of forces requiring simultaneous movement
D A force system described as having multiple sources of force