Virtual TAU notes

• mistake correction: "Bank sends message to all 3 years saving account owners to come to the bank for the meeting with clerk."
• all messages are sent only to relevant accounts
• Implement a Factory method or Factory class is permitted
• recommended parameter to Account: Account(FAMILY_TYPE, period, precentOnDep);
• It is possible to implement the Observer design pattern as follow:
  1. Account class - which has the full functionality of Observer (instead of derived from it).
  2. Bank class - which has the full functionality of Singleton and Subject (instead of derived from it).
• There is no need to implement the exact time of Account creation, indicating only the years is enough.