The question is asking to states the formal and informal qualifications. The answer would be the following:
(FORMAL QUALIFICATIONS)
1. Must be at least 25 years of age
2. must be a citizen of U.S. for at least 7 years.
3. must be inhabitant of the Senate from which you are elected.
(INFORMAL QUALIFICATIONS)
These have to do with a candidate's vote-getting abilities....
1. Party identifications
2. Name familiarity
3. Gender
4. Ethnic Characteristics
5.Political experience