I. Even the meaning of a statute or concept is plain and clear, the other types of interpretation must be used.

II.  According to the systematic interpretation, judges have the duty to search for what the legislature meant when enacting the text, which raises the question of how the intention of the legislator is to be ascertained in such a case. 

III."Cessante ratione legis cessat ipsa lex" is a teleological method which takes into account the so-called ‘nature of the thing’. 

Which of the statement(s) is/are true?