A sample of 400 Regina households is selected and several variables are recorded. Which of the following statements is correct?

a) Total household income (in $) is interval level data.

b) Socioeconomic status (recorded as low income, middle income, or high income is nominal level data.

c) The number of people living in a household is a discrete variable.

d) The primary language spoken in the household is ordinal level data.

e) None of the above.