单选题：Given the following game tree, the red node will be pruned with

Given the following game tree, the red node will be pruned with α-β pruning algorithm if and only if __. @[D](3)




A. $$6 \leq x\leq13$$
B. $$x\geq13$$
C. $$6 \leq x\leq9$$
D. $$x\geq9$$




A.$$6 \leq x\leq13$$
B.$$x\geq13$$
C.$$6 \leq x\leq9$$
D.$$x\geq9$$


答案：D