One urn, U1, contains one blue ball (labeled B1) and three red balls (labeled R1, R2, and R3). A second urn, U2, contains two red balls (labeled R4 and R5) and two blue balls (labeled B2 and B3). An experiment is performed in which one of the two urns is chosen at random and then two balls are randomly chosen from it, one after the other without replacement. (a) Construct the possibility tree showing all possible outcomes of this experiment. (Select the correct possibility tree.) A tree diagram is shown. There are 2 edges extending from the root of the tree. The first edge from the root goes to a vertex labeled U1. There are 4 edges extending from this vertex. The first edge from this vertex goes to a vertex labeled B1. There are 3 edges extending from this vertex. The first edge from this vertex goes to a vertex labeled R1. The second edge from this vertex goes to a vertex labeled R2. The third edge from this vertex goes to a vertex labeled R3. The second edge from this vertex goes to a vertex labeled R1. There is 1 edge extending from this vertex. The first edge from this vertex goes to a vertex labeled B1. The third edge from this vertex goes to a vertex labeled R2. There is 1 edge extending from this vertex. The first edge from this vertex goes to a vertex labeled B1. The fourth edge from this vertex goes to a vertex labeled R3. There is 1 edge extending from this vertex. The first edge from this vertex goes to a vertex labeled B1. The second edge from the root goes to