In the application of chi-square,
1. no theoretical frequency should be small since in the derivation of chi-square continuity assumptions are made.
2. the constraint imposed on cell frequencies must be linear.
3. regroup the frequencies whenever some expected frequency was small.
4. the correction is needed, when some cell frequency was small, i.e. less than 5.
Which of the statements given above are correct?

A. 1, 2 and 3

B. 2, 3 and 4

C. 1, 3 and 4

D. None of these

Answer: Option B