3. Consider the following set of tables describing students and school clubs:

Student
SID	Name	Gender	Status	GPA
100	Bill	M	Fr	3.3
101	John	M	So	2.1
102	Sue	F	Jr	3.2
103	Mary	F	Sr	3.6
105	Jane	F	Fr	2.9

Clubs
CID	Name	MtgRm
1	Chess	144
2	Debate	145

ClubMemberships
CID	SID
1	100
1	200
1	300
2	300
2	400

1. Assuming that SID and CID are unique identifiers, what are likely primary keys for the Student and Clubs tables?
2. What is the primary key for the ClubMemberships table?
3. What are foreign keys necessary for this set of tables in order to ensure that only registered students can be in clubs and students can only join registered clubs?
4. Can you add the following tuple to the ClubMemberships table based on your foreign keys: (3, 200) Why or why not?
5. Can you add the following tuple to the ClubMemberships table based on your foreign keys: (1, 101) Why or why not?