Option (1) is incorrect: FIR made under Section 154 of the Code of Criminal Procedure cannot be used as a substantive piece of evidence.
Option (2) is incorrect: FIR is an initial process to start an investigation of an offence.
Option (3) is correct: An FIR is just to inform the police about an offence, but this information or statement by the informant cannot be used as evidence or previous statement for any purpose in further proceedings of a case.
Option (4) is incorrect: The informant need not be an eye witness of an offence. A person having a knowledge of an offence can inform the police.