Quiz Yourself on Boolean Expressions and if Statements

Consider the following code:

String s1 = "Sorry", s2 = "sorry", s3 = "shelves";
boolean answer1 = s1.compareTo(s2) == 0;
boolean answer2 = !(s1.compareTo(s3) < 0);
boolean answer3 = !(s1.substring(2,3).equals(s2.substring(3,4)));
boolean answer4 = !(s2.length() < s3.indexOf("e"));

Which boolean variables in the above code are initialized to false?