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Its a dummy activitty. The answer is C
The definition is "logic dummy" activity, however there is a slight improvement in the definition.
Logic dummies in CPM serve to represent the logic sequencing connection between a prior set of activity and a following activity, the latter which does not require100% but only some of preceding activities to be completed in order to start. It is normally shown in broken lines.
In short there a logic sequencing between the activities but the latter is not100% dependent from the former.
it was introduce to preserve the integrity of the logic sequencing and to avoid contamination of the critical path.
My answer is option (C) Dummy
C >>>>>>>>>>>>>>>>>>>>>>> dummy
