What changes will lead to a successful compilation

What changes will lead to a successful compilation of the following code? Select all that apply.


public class LocalVsInstance {    
    String s;
    
    public static void main(String[] args) {
        String s;
        System.out.println(s.toUpperCase());
        LocalVsInstance localVsInstance = new  LocalVsInstance();
        System.out.println(localVsInstance.s.toUpperCase());
    }

}

Explanation

Local variable should be explicitly initialized for successful compilation, null value will do. Instance of s object will be implicitly initialized with null value. Even though NPE will fall, it will already be a run-time error.