Geeta Chandran is widely recognized as a prominent Bharatnatyam dancer. Bharatnatyam is a classical Indian dance form that originated in Tamil Nadu. Geeta Chandran has dedicated her life to mastering and performing this art form, and she is known for her exceptional skills and artistry as a Bharatnatyam dancer.

Option 2, Classical Carnatic vocalist, refers to a different art form called Carnatic music, which involves singing. Geeta Chandran is not primarily known for her singing abilities in this genre.

Option 3, Film director, is also not correct as Geeta Chandran is not involved in directing films. Her expertise lies in the field of dance.

Option 4, Exponent of Violin, refers to someone who is highly skilled in playing the violin. Geeta Chandran, however, is not known for her proficiency in playing this musical instrument.

In conclusion, the correct answer is option 1, Bharatnatyam dancer, as Geeta Chandran is renowned for her excellence in this form of classical dance.