Acertain company has five departments, a, b, c, d, and e. the number of employees in each department is 10, 10, 20, 30, and 30, respectively. a sample of 10 employees from all employees will be selected. of the following descriptions of sampling procedures, which is most likely to introduce a potential source of bias?

randomly select 10 employees from department c
a

randomly select 10 employees from all 100 employees
b

randomly select 2 employees from each of the five departments
c

randomly select 1 employee from each of a and b, 2 employees from c, and 3 employees from each of d and e
d

randomly select every tenth employee from a randomized list of names of all employees