Answer : 3. "Atul Kumar Chaudhary"
Explanation :

The central government has recently appointed Atul Kumar Chaudhary as the new secretary of the Telecom Regulatory Authority of India (TRAI), a post that was vacant since the retirement of V Raghunandan on May 31. Chaudhary is a 1989 batch Indian Telecom Service officer and is currently working as Deputy Director General (DDG) in the Unique Identification Authority of India (UIDAI).