Explanation:

- Option 1: Sunil Batra Vs. Delhi Administration 1979, Supreme Court

- The Supreme Court ruled on prisoner rights, including the right to legal aid, giving emphasis on the need for protective measures for prisoners.

- Correct Answer: This case allowed help free legal services to prisoners.

- Option 2: Hussainara Khatoon Vs. Home Secretary, State of Bihar

- This case highlighted the plight of undertrial prisoners and stressed speedy trials as part of the right to life and personal liberty.

- Option 3: SP Gupta Vs. Union of India, 1981, Supreme Court

- Focused on judicial independence and transparency, setting the stage for greater access to court for public interest litigations.

- Option 4: Bandhuva Mukti Morcha Vs. Union of India, 1983, Supreme Court

- Related to child labor and bonded labor, dealing with the exploitation of laborers and their rights.