Consider the following sentences: (a) The Vedas and Epics are the two literary sources of the Vedic Period. (b) In the early Vedic period the Aryans settled near the Sapt Sindhu and named it Aryavarta. (c) In the later Vedic period they settled along the river Ganga and Yamuna, and called it Brahmavarta. (d) All the sacred books, containing the wisdom of the Aryans, are collectively termed as the 'Vedic Script'.Which of the above statements is correct?