Which of the following example of a systematic probability sampling? * a. A teachers writes the name of each student in a card, shuffles the cards & then draw five names. b. Supervisors are selected...

Which of the following example of a systematic probability sampling?
 *

a. A teachers writes the name of each student in a card, shuffles the cards & then draw five names.

b. Supervisors are selected using random numbers in order to determine Annual salaries

c. Every 12th customer entering a shopping mall is asked to select his or her face store.

d. All of the above