有如下代码：

public interface Foo { 
    int k = 4; /* Line 2 */ 
} 

哪三段代码等同于/* Line 2 */ ？(     )

1. final int k = 4;

2. public int k = 4;

3. static int k = 4;

4. abstract int k = 4;

5. volatile int k = 4;

6. protected int k = 4;