During the recruitment of Huaguang High-tech Company, there were 5 shortlisted members including Xiao Zhang, Xiao Li, Xiao Wang, Xiao Zhao, and Xiao Qian. From the educational background, 2 of these 5 were masters and 3 were doctors; from the age point of view 3 of these 5 people are younger than 30 years old and 2 are older than 30 years old. It is known that Xiao Zhang and Xiao Wang belong to the same age group, while Xiao Zhao and Xiao Qian belong to different age groups; Xiao Li and Xiao Qian have the same degree Xiao Wang and Xiao Zhao have different degrees. In the end, only one master's degree older than 30 was successfully applied. Based on this, who can launch a successful candidate? ['Xiao Zhang.', 'Xiao Wang.', 'Xiao Zhao.', 'Small money.']