The system for selling cinema tickets calculates the discount type based on the client’s birth year (BY) and on the current year (CY) as follows: Let D be the difference between CY and BY, that is, D = CY – BY.  If D < 0 then print the error message “birth year cannot be greater than current year”  If 0 ≤ D < 18 then apply the student discount  If 18 ≤ D < 65 then apply no discount  If D ≥ 65 then apply the pensioner discount Your test suite already contains two test cases:  BY = 1990, CY = 2020, expected result: no discount  BY = 2030, CY = 2029, expected result: print the error message Which TWO of the following test data sets should be added to achieve full valid equivalence partitioning coverage for the discount type?