Create the UML Design Class Diagram for the scenario using 2 DESIGN PATTERNS (Observer, Strategy, Singleton etc.)

1,190 words High-Level Requirements: OutdoorPowerEquipmentDepot retailer would like to have an application that will give it the competitive advantage over its rivals to offer its customers maximum flexibility, speed, simplicity, and freedom to buy, trade-in, and lease outdoor power Equipment. Using the newly introduced online PowerEauiomentTradeinMorket software, the retailer employees and customer can determine the current market value of the trade-in equipment in a matter of seconds Customer/Salesman/ Manager PowerEqujpmentTradeinMarket OutdoorPowerEquipmentDepot 1,190 words High-Level Requirements: OutdoorPowerEquipmentDepot retailer would like to have an application that will give it the competitive advantage over its rivals to offer its customers maximum flexibility, speed, simplicity, and freedom to buy, trade-in, and lease outdoor power Equipment. Using the newly introduced online PowerEauiomentTradeinMorket software, the retailer employees and customer can determine the current market value of the trade-in equipment in a matter of seconds Customer/Salesman/ Manager PowerEqujpmentTradeinMarket OutdoorPowerEquipmentDepot