There are several graduate students living in a dormitory, one of whom is Heilongjiang, two are northerners, and one is from Yunnan. Two people only took logical philosophy this semester, and three people took classical music appreciation this semester. Assuming that the above introduction covers all the people in this dormitory, how many people may it be at least? How many people may it be? ['The minimum may be 3 and the maximum may be 8.', 'The minimum may be 5 people, and the maximum may be 8 people.', 'The minimum may be 5 people, and the maximum may be 9 people.', 'The minimum may be 3 people, and the maximum may be 9 people.']