Correct Option: 4 - both (a) & (b)

Explanation:

An arrested person has the right to consult a legal practitioner of their choice. However, the consultation must adhere to certain conditions:

• The consultation may not be in the presence of the police officer (option a), ensuring confidentiality.
• Alternatively, the consultation may be in the presence of the police officer but not within his hearing (option b), to maintain some degree of privacy while allowing the presence of law enforcement.

This ensures that the arrested person's right to legal advice is respected while balancing the interests of the authorities.