This question is misleading because "overtaking" seems like the action of beginning and/or during the process of overtaking another vessel. You wouldn't just see the stern light.
Deck
Rules of the Road: BOTH INTERNATIONAL & INLAND Which light(s) will be visible to a vessel overtakin...
Discussing this exam question.
CSCHANTZ84- The question is posed as "overtaking" which means it's an action that is starting to happen, had it said "overtaken" that would be different.