Question: Based on the below code, what will be the sequence of the tasks? op _ A . set _ downstream ( op _ D )

Based on the below code, what will be the sequence of the tasks?
op_A.set_downstream(op_D)
op_D.set_downstream([op_B,op_C])
op_B.set_downstream(op_E)
op_C.set_downstream(op_E)
op_A ->[op_B ,op_C]->op_D -> op_E
op_A -> op_D ->[op_B ,op_C]-> op_E
op_A -> op_E ->[op_B ,op_C ]-> op_D
None of above

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