Which of the following interchange of numbers and mathematical signs would make the given equation correct?
72 ÷ 8 × 9 − 36 + 20 = 80
 

1
20 and 80, × and +
2
9 and 36, × and ÷
3
36 and 72, ÷ and −
4
8 and 9, + and −

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