The answers are b and b,d,e(together) respectively. Please explain why

Task 2 Task 1 Task 4 Task 3 Suppose that the two gateways are of type AND. If 3 instances of this model are started at the same time, what can we say about their execution logs (keeping a record of the successfully executed tasks) before completion of any of the instances?: a) They are exactly the same at any time b) If Task 3 is included in all execution logs, then also Task 1 c) If Task 3 is included in all execution logs, then also Task 2 d) If Task 2 and Task 3 is included in the execution log of one instance, then the other instances should at least have Task 1 in their execution log Consider the same workflow model as in Question 16. Suppose the two gateways are of type XOR. If 3 instances of this model are started at the same time, what can we say about their execution logs after all instances have completed?: a) They are exactly the same b) They all contain 3 tasks c) They all contain 4 tasks d) They may be the same e) They may be different Task 2 Task 1 Task 4 Task 3 Suppose that the two gateways are of type AND. If 3 instances of this model are started at the same time, what can we say about their execution logs (keeping a record of the successfully executed tasks) before completion of any of the instances?: a) They are exactly the same at any time b) If Task 3 is included in all execution logs, then also Task 1 c) If Task 3 is included in all execution logs, then also Task 2 d) If Task 2 and Task 3 is included in the execution log of one instance, then the other instances should at least have Task 1 in their execution log Consider the same workflow model as in Question 16. Suppose the two gateways are of type XOR. If 3 instances of this model are started at the same time, what can we say about their execution logs after all instances have completed?: a) They are exactly the same b) They all contain 3 tasks c) They all contain 4 tasks d) They may be the same e) They may be different