Bigamy: refers to the fact that a married man and woman who have a spouse do not go through the divorce procedures and register their marriage with another person, or do not register a marriage but live with another person to form a de facto marriage relationship, and the behavior of unmarried men and women who know that others have a spouse and marry with them.
According to the above definition, which of the following is bigamy?
A marries B without knowing that he is married.