What key is the right key in mission 3?

In Mission 3, the right key is typically identified as the one that unlocks the designated door or provides access to the next objective. Players often need to interact with various clues or hints within the mission to determine which key is the correct one. Pay attention to any visual cues or in-game dialogues that may provide guidance on the key's significance. If you need more specific details, please provide the name of the game or context for Mission 3.