![](https://cos-cdn.shuashuati.com/pipixue-wap/2020-1230-1107-53/ti_inject-812ce.png)
What is the procedure of post-pruning?
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 la st, 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