Consider the following statements
1. Harappans evolved some new techniques in metallurgy and produced copper, bronze, lead, and tin. The engineering skill of the Harappans was remarkable, especially in building docks.
2. In 2001, archaeologists studying the remains of two men from Mehrgarh, Pakistan, made the discovery that the people of the Indus Valley Civilization, from the early Harappan periods, had knowledge of proto-dentistry.
3. Later, in April 2006, it was announced in the scientific journal Nature that the oldest (and first early Neolithic) evidence for the drilling of human teeth in vivo (i.e., in a living person) was found in Mehrgarh.
4. Eleven drilled molar crowns from nine adults were discovered in a Neolithic graveyard in Mehrgarh that dates from 7,500-9,000 years ago.
5. According to the authors, their discoveries point to a tradition of proto-dentistry in the early farming cultures of that region
Select the correct answer using the codes given below.
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