Under professional communications under s. 126 of the Indian Evidence Act, 1872, who all are covered?

S.126. Professional communications. –– No barrister, attorney, pleader or vakil shall at any time be permitted, unless with his client’s express consent, to disclose any communication made to him in the course and for the purpose of his employment as such barrister, pleader, attorney or vakil, by or on behalf of his client, or to state the contents or condition of any document with which he has become acquainted in the course and for the purpose of his professional employment or to disclose any advice given by him to his client in the course and for the purpose of such employment: