如下程序的运行结果为：（ ）。

interface A {
}

class C {
}

class B extends D implements A {
}

public class Test {
public static void main(String] args) {
B b = new B();
if (b instanceof A)
System.out.println("b is an instance of A");
if (b instanceof C)
System.out.println("b is an instance of C");
}
}

class D extends C {
}

选项：

A:

没有输出

B:

b is an instance of A

C:

b is an instance of
C:

D:

输出b is an instance of A，然后是b is an instance of
C: