Which of the following statements is/are true concerning conditions for chi-squared procedures involving two-way tables?

I.Data must come from a random sample or random samples.II.Expected counts must all be greater than $1$, and no more than $20\%$ of expected counts can be less than $5$.III.$Np$ and $N(1-p)$ must both be greater than $5$ where $N$ is the number of trials and $p$ is the proportion of successes.