Problem $1$:

The local city youth league needs a database system to help track children that sign up

to play soccer. Data needs to be kept on each team and the children that will be playing

on each team and their parents. Also, data needs to be kept on the coaches for each

team. Consider the following ERD:

a$)$ Write short sentences to identify all connectivities, cardinalities, and

participations that are reflected in ERD.

Example: A Player must play for a Team and only one Team.

b$)$ Write down all referential integrity constraints.

Example: COACH.Team$\_$ID must exit in TEAM.Team$\_$ID