In cocker spaniels, solid coat color is dominant over spotted coat color. If two heterozygous dogs were crossed to each other, what would be the probability of the following combinations of offspring?
a. Litter of 5 pups, 4 solid fur, 1 spotted fur
b. 1st litter with 6 pups, 4 solid fur, 2 spotted fur; 2nd litter with 5 pups, all solid fur
c. 1st litter with 5 pups, firstborn solid, among next four 3 solids & 1 spotted; 2nd litter of 7 pups, firstborn spotted, second born spotted, among next five 4 solids & 1 spotted