According to Manu, which of the following are the sources from which knowledge of Hindu Law is to be…

Manu names as sources of dharma the Veda (Shruti), the Smriti, the approved usage or conduct of virtuous men (sadachara), and what is agreeable to one's own conscience. Of the given items, Shruti, Smriti and approved usage all appear in his list, so a choice leaving out any of them is incomplete. The Puranas are not among the sources Manu names.