A person is standing in a room that has 3 locked doors and there are three colored keys on a keyring: one red, one yellow and one green. They have been provided the following information: each of the green and the yellow keys can unlock only one door, but the red key can be used to unlock two of the doors once opened, the middle door is followed by an additional door whose key is not among the three keys the first door can't be unlocked by the red key the last door can't be unlocked by the green key the person has only one attempt to use the correct key and exit the room. Which of the following attempts is the right one?.