answer :C
it's important not to skim that ExSuper extends from Exception class that have following constructors :
public Exception(Throwable cause)
public Exception(String message,
Throwable cause)
public class ExSub extends ExSuper{
Compilation actually fails on this line,you can't have 2 public classes in the same file...
However,if we neglect this,I think C would be the correct answer.
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