Statement 1 is correct. Warfare Evidence suggests the Rigvedic Aryans used protective gear like coats of mail and helmets in battle, while there's no clear indication of similar armour usage by the Indus Valley civilization.

Statement 2 is incorrect. Both Rigvedic Aryans and Indus Valley people were familiar with gold, silver, and copper. Iron usage has been limited to Vedic Aryan culture while Harappans were unaware of Iron.

Statement 3 is correct. Horse Domestication: The Rigveda contains numerous references to horses, suggesting they were well-known and likely domesticated by the Rigvedic Aryans. There's no clear evidence of horse domestication or use in the Indus Valley civilization.