What is the level of measurement for these items related to the newspaper business?
a. The number of papers sold each Sunday during 2016.
b. The number of employees in each of the departments, such as editorial, advertising, sports, and so on.
c. A summary of the number of papers sold by county.
d. The number of years with the paper for each employee.
e. The number of male and female employees.
f. The height of each employee.