Consider the following statements regarding the decline of the Indus Valley Civilization: 1. Mortimer Wheeler proposed the 'Aryan Invasion' theory based on unburied skeletons found at Mohenjo-Daro. 2. Recent scientific consensus attributes the decline primarily to catastrophic tectonic upheavals and prolonged drought due to monsoon shifts. 3. The decline resulted in the complete extinction of Harappan cultural traits in the subcontinent. Which of the statements given above is/are correct?