Tata Sons has cited legal opinions from former Chief Justice of India U U Lalit and former Supreme Court judge Justice B N Srikrishna to back the validity of its board decision to reappoint N Chandrasekaran as executive chairman for another five-year term. The company shared the legal opinions in its response to an email from Tata Trusts Chairman Noel Tata questioning the legality of the resolution passed at the Sept. 17 board meeting.