Consider the arrangement of learning bridges shown in the following figure. Assuming all are initially empty, give the forwarding tables for each of the bridges B1-B3 after the following transmissions: (1) A sends to B; (2) D sends to B; (3) X sends to D; (4) Y sends to A; (5) F sends to Y; (6) E sends to X; A B D E F B1 B3 2 2 2 B2 3 X Y z