Consider the following statements regarding the 'Rowlatt Satyagraha':

I. Gandhiji asked the Indian people to observe 13 April 1920 as a day of “humiliation and prayer” and hartal (strike).

II. Satyagraha Sabhas were set up to launch the movement.

III. The Rowlatt Satyagraha turned out to be the first all-India struggle against the British government although it was largely restricted to villages.

Which of the above statement(s) is/are correct?