Explanation:

- Lord Lytton: Served as the Viceroy of India from 1876 to 1880. Known for his controversial policies like the Vernacular Press Act and organizing the Delhi Durbar to proclaim Queen Victoria as Empress of India.

- Lord Cornwallis: Known for reforms in the British administration in India, especially the Cornwallis Code. His rule was much earlier (1793–1798), and he was not associated with CP Ilbert.

- Lord Ripon: CP Ilbert served as the law member of the Viceroy’s council under him. Lord Ripon is known for his liberal policies, including the Ilbert Bill, which aimed to allow Indian judges to preside over cases involving Europeans.

- Lord Curzon: Viceroy of India from 1899 to 1905. Known for administrative reforms and the partition of Bengal in 1905.