Which of the following statement(s) is/are found to be correct? I. Ashoka was the grandson of Chandragupta and the son of Bindusara and is regarded as one of the greatest kings of all times. II. The most significant edict which depicts Ashoka's life is the Rock Edict XIII which gives an account of the eight years of the Kalinga war. III. Ashoka began to propagate Buddhism and the concept of Dharma Vijay over military conquest.