Which of the following statement(s) about the history of Kerala are true?

i. The Kingdom of Travancore was formed in the 18th century.
ii. Kerala State was created by the merger of Malabar, Travancore, and Cochin in 1956.
iii. The 'Vaikom Satyagraha' was a movement against untouchability.
iv. The first Kerala High Court was established in 1866.