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Question 3: (CLO3, C2, PLO2) Suppose that the following Graphic User Interface (GUI) is developed by a programmer. It shows an outcome of Windows Form application with GUI controls in Visual Basic .Net. It is used to compute the required total with discount a customer. Variable name: bxtName Variable name: btnAdd Variable name: IstName Variable name: IbiTotal i) CashierApp-Visual Programming CashierApp of WOU Supermarket tem Pric Discount 2371.00 ii) iii) iv) tem Name iPad Wi-Fi + Cellular 128GB - Silver Add 21.5-inch iMac with Retina 4K display 13-inch MacBook Pro-Space Gray Apple Watch Series4 GPS 44mm Nike+ Sport Band iPhone XS Max 512GB Silver 5968.66 8990.12 1899.03 7049.51 23907.32 Total Price in Ringgit (after discount) Class and instance Encapsulation and information hiding Inheritance Polymorphism Total Hints: Refer Topics 2, 6 and 10 in both course and supplementary materials. X 299882K Variable name: bxtPrice Relate the following principles of Object-Oriented Programming (OOP) based on the given GUI. Explain all the following OOP principles with any of above adopted controls. Variable name: IstDiscount Variable name: IstPrice Variable name: btn Total Support your elaborations either with related graphic/diagram illustration and/or sample of VB .Net. code. [40 marks]