下面程序的运行结果是class A { protected static int count = 0; public A() { count++; }}class B extends A { public B() { count++; }}public class Test { public static void main(String args[]) { B x = new B(); System.out.println("count=" + x.count); }}
选项：

A:count=1
B:count=2
C:count=3
D:count=4