Consider the following method 1.double calculateBill(int usage){ 2. double bill = 0; 3. if (usage > 0){ 4. b

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Consider the following method
1.double calculateBill(int usage){2. double bill = 0;3. if (usage > 0){4. bill = 40;5. }6. if (usage > 100){7. if (usage <= 200){8. bill += (usage–100) *0.5;9. }10. else{11. bill += 50+(usage-200) *0.1;12. if (bill >= 100){13. bill = bill *0.9;14. }15 }16. return bill;17. }
Select all the statements that are true
(4,8) is a DU pair for "bill"
(1,4) is a DU pair for "usage"
The use of "bill" in line 13 is a p-use
(12,13) is a DU pair for "bill"
The use of "usage" in line 8 is a c-use