给出以下代码,请问该程序的运行结果是什么?class Tree {}class Pinc extends Tree{}class Oak extends Tree{}public class Forest {public static void main (String [] args){Tree tree = new Pinc();if (tree instanceof Pinc)System. out. printin (“Pinc”);if (tree instanceof Tree)System. out. printin (“Tree”);if (tree instanceof Oak);System. out. printin (“Oak”);elseSystem. out. println (“Oops”);}}

A. 打印输出Pinc
B. 打印输出Tree
C. 打印输出Oak
D. 打印输出Oops
E. 无内容输出。