3. [2pts.Each] Identify the type of sampling used (random, is systematic, convenience, stratified or cluster): a) b) d) A lobby has a list of the 100 senators of the United States. In order to determine the Senate's position rewarding farm subsidies, they decide to talk with every seventh senator on the list starting with the third. A college counselor selected 50 randomly students from each class (Freshmen, Sophomore, Juniors, and Seniors). During the last Presidential election, CNN conducted an exit poll in which specific polling stations were randomly selected and all voters were surveyed before they left the premises. A bank mailed their own account holders in LA about. the effectiveness of branch operations.