Consider the following statements about Dr. Rajagopala Chidambaram:

1. He served as the Principal Scientific Adviser to the Government of India from 2001 to 2018.
2. He played a pivotal role in India's nuclear tests conducted in 1974 and 1998.
3. He was awarded the Padma Bhushan in 1999 for his contributions to science and technology.

Which of the above statements is/are correct?