Investigators want to conduct a university survey pertaining to the number of hours of paid work postgraduate students complete each week. Which one of the following sampling methods will most likely result in a randomly representative sample of postgraduate students?

(a) Use a university enrolment list to randomly select postgraduate students from the list and approach

these students individually to ask them to fill out the survey.

(b) Survey each postgraduate student at the university.

(c) Ask for postgraduate student volunteers to fill out the survey.

(d) Ask all the students of MATH1324 to fill out the survey.