public class foo {  public static void main （String[]args） {  String s；  system.out.printIn （“s=” + s）；  }  }   What is the result？（）  

• A、 The code compiles and “s=” is printed.
• B、 The code compiles and “s=null” is printed.
• C、 The code does not compile because string s is not initialized.
• D、 The code does not compile because string s cannot be referenced.
• E、 The code compiles， but a NullPointerException is thrown when toString is called.