The explanation of the options is as follows:

Option 1 suggests that when a prisoner sufficiently makes a case, parole cannot be denied because it becomes his/her right to have it. However, this statement is incorrect because parole is not a right of the prisoner but a discretionary power of the concerned authority.

Option 2 suggests that State Governments have their own Prisoners Release on Parole Rules. This statement is correct. Different states in India have their own set of rules and terms for releasing prisoners on parole.

Option 3 suggests that both statements are correct, which is not the case as explained above.

Option 4 suggests that neither of the statements is correct. This is incorrect as statement 2 is correct.

Therefore, the correct answer is "2 only" as only the second statement is true.