A simple random sample of n subjects is selected in such a way that every possible sample of the same size n has the same chance of being chosen.​ (A simple random sample is often called a random​ sample, but strictly​ speaking, a random sample has the weaker requirement that all members of the population have the same chance of being​ selected.) Determine whether each of the following is a simple random sample and a random sample. Complete parts a through c.