In a class hierarchy,
a. the more general classes are toward the right of the tree and the more specialized classes are toward the left.
b. the more general classes are toward the left of the tree and the more specialized classes are toward the right.
c. the more general classes are toward the bottom of the tree and the more specialized classes are toward the top.
d. the more general classes are toward the top of the tree and the more specialized classes are toward the bottom.