Answer : 4. "सी-मेट, हैदराबाद"
Explanation :

Center for Materials for Electronics Technology (C-MET) is an autonomous scientific society under the Ministry of Electronics and Information Technology in India. It operates three R&D laboratories in Pune, Hyderabad and Thrissur, focusing on critical electronic materials. C-MET, Hyderabad, is dedicated to developing advanced electronic and strategic materials. There is a major focus on eco-friendly e-waste recycling technologies to address India's 3.2 million tonnes of electronic waste and promote resource efficiency. C-MET's Center of Excellence on E-waste Management was inaugurated under PPP, leading in recycling technologies for various electronic components.