Which sentence uses commas correctly?
Select one:
1)The new teacher who had been, at the school, only two days, knew the name of each
of her students.
2)The new teacher who had been at the school only two days, knew the name of each
of her students.
3)The new teacher, who had been at the school only two days, knew the name, of each
of her students.
4)The new teacher, who had seen at the school only two days knew the name of each
of her students.