Which of the following statements are true? I. Every left-recursive grammar…

Which of the following statements are true?

I. Every left-recursive grammar can be converted to a 
   right-recursive grammar and vice-versa
II. All ϵ productions can be removed from any context-free 
    grammar by suitable transformations
III. The language generated by a context-free grammar all of whose 
     productions are of the form X --> w or X --> wY (where, w is a string of 
     terminals and Y is a non-terminal), is always regular
IV. The derivation trees of strings generated by a context-free grammar 
    in Chomsky Normal Form are always binary trees