Which of the following statements are correct?

i) Rani Gouri Lakshmi Bai was the only female ruler of Travancore who ruled with full administrative authority.
ii) The British-style Secretariat system in Travancore was introduced during the reign of Rani Gouri Parvathi Bai.
iii) Rani Gouri Parvathi Bai abolished the practice of forced labor (uzhiyavela) in government construction works.