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 A 19 90 2. B 20 90 3 18 80 4 D 19 70 5 E 20 60 6 F 21 60 Construct a clustered index on age using Alternative (2) Ci.e. by reference)