What following method$($s$)$ can a plaintiff use to establish a prima facie case of discrimination?

Intuition: Adverse impact exists if the difference between the selection ratios of the two groups offends the judge's subjective notions of fairness.

The bottom$-$line rule: Adverse impact exists if the selection ratio for the minority group is less than the selection ratio for the majority group when looking at the bottom line.

The $95$ percent confidence level: Adverse impact exists if the difference between the selection ratio is one that, statistically speaking, would not be expected to arise by chance alone more than $5$ percent of the time.

The $\frac{4}{5}$ rule: Adverse impact exists if the selection ratio for the minority group is less than four$-$fifths $($or $80\%)$ of the selection ratio for the majority group.

none of these choices.