The operator of the local mall wants to find out how many of the mall’s employees make purchases in the food court when they are working. She hopes to use these data to increase the rent and attract new food vendors. In total, there are 1023 employees who work at the mall. The best method to obtain a random sample of the employees would be to surveya. all 170 employees at each of the larger storesb. 50% of the 90 employees of the food courtc. every employeed. every 30th employee entering each mall entrance for one week