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Consider the instance of the Students relation shown in the table below. Assume these tuples are stored in a sorted file in the order shown. Each page can store up to two tuples. Sid Name Age gpa 1 . 19 60 B 20 90 N 3 18 80 4. D 19 70 5 E 20 90 6 F F 21 60 Construct a clustered index on gpa using Alternative (2) (i.e. by reference)