He scratched his hands badly while pruning the ruse-bushes. A: rubbed B: tore C: stroke D: clawed

Post-pruning in CART consists of the following procedure: A: First, consider the cost complexity of a tree. B: Then, for each internal node, N, compute the cost complexity of the subtree at N. C: And also compute the cost complexity of the subtree at N if it were to be pruned. D: At last, compare the two values. If pruning the subtree at node N would result in a smaller cost complexity, the subtree is pruned. Otherwise, the subtree is kept.