3894. Traffic Signal Color

You are given an integer timer representing the remaining time (in seconds) on a traffic signal. The signal follows these rules: - If timer == 0, the signal is "Green" - If timer == 30, the signal is "Orange" - If 30 < timer <= 90, the signal is "Red" Return the current state of the signal. If none of the above conditions are met, return "Invalid". Example 1: Input: timer = 60 Output: "R