Which sentence is punctuated correctly?
Michelle Obama is the wife of the 44th president, she is the first African American first lady
Michelle Obama is the wife of the 44th president; she is the first African American first lady.
Michelle Obama is the wife of the 44th president she is the first African American first lady.
The second answer has ';' which is not needed. For this case at least. Number one has a comma, which is needed, the third answer was overall not punctuated correctly.
