A software application is supposed to calculate square root of all integers from 1 to 32767. The tester divides the input into valid and invalid equivalence classes. Valid equivalence class: 1-32767, invalid: all negative numbers, all numbers > 32767, all non-integers etc.
However, when square root for all numbers in the valid equivalence class was calculated, it was found that for 3 number, the results were incorrect. These number were not the boundary values.
Which of the following is correct?
A . It is sometimes possible to find that some values in equivalence class do not behave in the same manner as rest of the class.
B . The tester should always try all possible.
C . It is practically impossible for values in an equivalence class to behave in different manner.
D . The tester chose equivalence classes incorrectly.
Answer: A