Among the four members of Zhou, Wu, Zheng, and Wang of the Peking University Eagle Club, only one person has ever boarded Zhuoyou Youfeng. When the reporter interviewed them, Zhou said: "It is the team member Zheng who boarded Zhuoyou Youfeng. " Said: "I haven't participated in any climbing activities yet. " Wu said, "Although I also participated in that climbing activity, I didn't reach the summit. " Wang said, "I'm a candidate for team Wu, if he didn't reach the summit, then I reached the top. ". If only one of them has spoken falsely, which of the following must be true? ['Other members of the Peking University Eagle Club have also boarded Zhuoyou Youfeng.', 'Wu or Zhou boarded Zhuoyou Youfeng.', 'Zheng boarded Zhuoyou Youfeng.', 'Wang boarded Zhuoyou Youfeng.']