19 configurations are shown in this textbook diagram for the 3 distributions that yield a total energy of 4. How many configurations correspond to each distribution? CD BD BC AD AC AB 2 E 0 AB ACAD BC BD CD 2 28 D BC BD B CD CD B B D AC B C AD B. E 0 2 E 0 0 D AB C B AD A BD C B A ABAC BC D D D D 2 ABCD E 0 distribution with 2 particles in level 1 and 2 particles in level 3 B 6 configurations B 12 configurations distribution with 2 particles in level 2 and 1 particle each in levels 1 and 3 distribution with all 4 particles in level 1 B 1 configuration