Which of the following statement(s) is/are found to be incorrect? I. Chandragupta, who ruled from 320 to 300 BC, was the architect of the first Indian imperial power-the Mauryan Empire. II. Chandragupta Maurya's army consisted of more than 600,000 infantry, 50,000 cavalry, 10,000 elephantry and 7000 chariots. III. The rule of the Nanda Dynasty was overthrown by Bindusara whose capital was Patliputra, near the modern day Patna in Bihar.