a$.$ Write business rules for the following ERDs.

b$.$ Convert the following ERD into a relational schema. Indicate all primary keys $($by underlining$)$ and foreign keys $($using asterisk$-*)$ for these relations.

Qn$2.$ Draw an ERD based on the following statement. State any necessary assumptions made.

a$.$ A musician can play many play instruments. An instrument is played by at most one musician.

b$.$ One branch can have zero or many customers and one customer can have an account in zero or one branch.