निम्नलिखित में से कौन सा अशोक का स्तंभ मूल रूप से वर्तमान उत्तर प्रदेश की भौगोलिक सीमाओं के भीतर नहीं पाया गया या स्थित नहीं था?

Who initiated a major archaeological excavation and research study at the Harappan site of Rakhigarhi in 2013?

Which metal was unknown to the Harappan people?

From whom did Alexander III of Macedon adopt the system of using carrier pigeons as messengers during his military campaigns?