Identify the relevant population and sampling frame, and indicate an appropriate sampling method for the situations below:
(a) The Human Resources Department wish to determine whether single parent employees have a higher rate of absenteeism than married employees.
(b) A building supply company wants to determine the amount of pilferage from its materials storage warehouses on the east coast.
(c) The State's Industry Ministry wants to determine the relationship between drug abuse and antisocial workplace behaveour.