After activityA, there is anexclusive gateway(with conditionscond1andcond2), soeither B or Cis chosen—never both.
AfterBandC, their flows go into a gateway with aplus sign, which is aParallel Gateway (AND-join)in BPMN.
AParallel Joinwaits fora token fromeveryincoming branchbefore it can release a token onward toD. But due to the earlier exclusive split,only oneof the two branches (B or C) ever receives a token. The other branch never activates, so the parallel join never gets all required tokens.
Consequences:
The join gateway willnever be satisfied,
Therefore, the flownever proceeds to activity D.
So the defect is exactly what optionBsays:
The activity D can never be reached.
That is the correct answer.
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