1. Create an ER diagram for the following requirements. Use cardinality ratio and participation constraints to indicate the relationship constraints.
   1. A Bank has a name, address, and a unique 5-digit code.
   2. Each bank has several branches. Each branch has a branch number that is unique among the branches of the bank it belongs to (but may be the same as a branch for a different bank). Each branch has a location.
   3. Each branch maintains its own set of accounts. An account has a unique account number, a type (such as checking or savings) and a current balance. An account may be shared between more than one customers.
   4. Each customer may have several accounts. A customer has a name, a social security number, an address, and a list of phone numbers where they may be reached.
   5. (25 pts) Create an ER diagram for the following requirements. Use cardinality ratio and participation constraints to indicate the relationship constraints.
      1. A Bank has a name, address, and a unique 5-digit code.
      2. Each bank has several branches. Each branch has a branch number that is unique among the branches of the bank it belongs to (but may be the same as a branch for a different bank). Each branch has a location.
      3. Each branch maintains its own set of accounts. An account has a unique account number, a type (such as checking or savings) and a current balance. An account may be shared between more than one customers.
      4. Each customer may have several accounts. A customer has a name, a social security number, an address, and a list of phone numbers where they may be reached.