Option 4: 2006 -> The Uttaranchal (Alteration of Name) Act, 2006 was enacted by the Parliament to rename the state from Uttaranchal to Uttarakhand. The Act came into effect on January 1, 2007. The state was originally formed as Uttaranchal on November 9, 2000, but was renamed to Uttarakhand to better reflect the traditional and popular name of the region. -> correct