When Data Is Collected Using a Qualitative, Nominal Variable, What

When data is collected using a qualitative, nominal variable, what is true about a frequency distribution that summarizes the data?

A) The upper and lower class limits must be calculated.
B) A pie chart can be used to summarize the data.
C) The number of classes is equal to the number of variable's values plus 2.
D) The "5 to the k rule" can be applieD.