Which of the following is correct about Puranas?

All of the above.

Puranas were compiled by Brahmanas (by about the middle of the first millennium CE). They contained much that had been composed and been in circulation for centuries, including stories about gods and goddesses. Generally, they were written in simple Sanskrit verse, and were meant to be read aloud to everybody, including women and Shudras, who did not have access to Vedic learning. Much of what is contained in the Puranas evolved through interaction amongst people – priests, merchants, and ordinary men and women who travelled from place to place sharing ideas and beliefs.