Statement (a) is incorrect because the protection against double jeopardy (Article 20(2)) applies to prosecution and punishment by a court of law or a judicial tribunal, not typically to departmental or disciplinary proceedings. Statement (c) is incorrect as the protection against self-incrimination (Article 20(3)) applies only to criminal proceedings, where a person is accused of an offence, and not to civil proceedings. Statement (b) is correct as the protection against self-incrimination covers compelled testimonial evidence, which can be in oral or documentary form.