Explanation:

- Correct Answer: Option 3 - Jay Shah was appointed as the secretary of the Board of Control for Cricket in India (BCCI) in October 2019. His appointment marked a significant moment as the BCCI underwent a leadership change during that period.

- Option 1: Brijesh Patel - He was a key figure in Indian cricket administration and was elected as the chairman of the Indian Premier League (IPL) Governing Council in October 2019, not as the secretary of the BCCI.

- Option 2: Sourav Ganguly - The former Indian cricket captain was appointed as the President of the BCCI in October 2019. His tenure was noted for his efforts to modernize the board's functioning.

- Option 4: Jayesh George - He was appointed as the Joint Secretary of the BCCI in October 2019, which differs from the role of the secretary of the board.

The role of secretary is crucial for the administration and functioning of the BCCI, and Jay Shah's involvement has been influential since his appointment.