The ABC Company generally divides its customers into three groups: preferred customers, general customers, and black-listed customers. 1. All customers will have attributes such as customer ID, name, and address. All customers will have operations such as register() and printCustomerInfo(). * The register() function will fill up a new customer's information. *The printCustomerInfo() displays an existing customer's information. 2. The preferred customers have an additional attribute: preferred-tiers. It has three levels tier1, tier2, and tier3.
3. The black-listed customers has an additional attribute: black-listed date.
Submission requirements:
1. A UML diagram
2. Source code of your program (file extensions must be .cpp or .h)
3. Necessary comments and brief description on how you design your program

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