Three people, A, B, and C, shoot a target, and each shoots three shots. The product of the ring numbers of the three hit targets is 60, and the ring number is a natural number not exceeding 10. Arrange the three people according to their total number of rings from high to low, followed by A, B, and C. May I ask: Who shot the shot with the 4th ring on the target?
甲、乙、丙三人打靶，每人打三枪．三人各自中靶的环数之积都是60，且环数是不超过10的自然数．把三个人按个人总环数由高到低排列，依次是甲、乙、丙．请问：靶子上4环的那一枪是谁打的？
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