Option (1) is incorrect: 'Professional Communication' between an advocate and his client is admissible in evidence.
Option (2) is incorrect: 'Professional Communication' between an advocate and his client is a privileged communication even after the contract rescinds.
Option (3) is correct: U/s 126 of Evidence Act, no barrister, attorney, pleader or vakil shall at any time be permitted to disclose any communication made to him in the course of his employment, unless with his client’s express consent.
Option (4) is incorrect: It is admissible whether it is legal or illegal.