❔ Polymorphism

public class BankBranch
   {
      //
      // This field keep a list of bank accounts.
      // Any type of accounts will be accepted
      // 
      private List<Account> _accounts;

      public BankBranch(string name)
      {
         Name = name;
         _accounts = new List<Account>();
      }

      // Auto-properties
      public string Name { get; set; }