Question: Which mountain peak was explored first, Sunanda Devi or Annapurna II? 
Sentence (from "Sunanda Devi"): Sunanda Devi (Hindi: सुनन्दा देवी ) previously known as Nanda Devi East is the lower of the two adjacent peaks of the highest mountain in Uttarakhand and second highest mountain in India; Nanda Devi is its higher twin peak.
Relevant evidence: No