Answer :
c. Is incorrect.
4^2 = 16 and 5^2 = 25. 12 is not between 16 and 25 so sr(12) is not between 4 and 5.
sr(12) is between 3 and 4
4^2 = 16 and 5^2 = 25. 12 is not between 16 and 25 so sr(12) is not between 4 and 5.
sr(12) is between 3 and 4