Bigamy: The act of having a spouse and marrying another person, or knowing that someone else has a spouse and marrying them. According to the above definition, which of the following is bigamy? ["Li Xiaoqing has been in love with Wang Gang for many years, held a formal engagement ceremony, and has accepted many colorful gifts from Wang Gang's family, but then Li Xiaoqing broke the marriage contract and married a foreign man.", 'Huang was ill-treated by her husband, so he got along with a colleague of the factory. Sometimes they secretly went out to travel together. After knowing it, his husband sued to the court and sued Huang and his colleague to remarry. The real husband in my mind is that colleague.', 'Axue ’s family lives in a remote village in Jiangxi, married and has a son. During a trip, he was abducted by a fellow villager to a remote mountain village in Anhui, sold to Qiu of the village, and became Qiu ’s wife without registration.', "Sun and Zhou were married for one year. They decided to divorce because of incompatibility. Zhou's parents immediately took their daughter home. Six months later, without going through the divorce formalities, Sun and another foreign woman married. Zhou also married a man in a neighboring village."]