Sorry, the image is not properly attached, The question is as follows:
Given that CharSequence is an interface implemented by both
String and StringBuilder classes, and then given the following method:
public <S extends CharSequence> S foo(S s){
//INSERT HERE
}
Which of the following can be inserted at //INSERT HERE to compile and run without error?
A return s;
B return (Object)s;
C return s.toString();
D return new StringBuilder(s);
E return (S)new StringBuilder(s);
F return null;