Design and implement a program that creates an exception class called , designed to be thrown when an improper designation for a document is encountered during processing. Suppose in a particular business all documents are given a two-character designation starting with either U, C, or P, standing for unclassified, confidential, or proprietary. If a document designation is encountered that doesn't fit that descrip tion, the exception is thrown. Create a driver program to test the exception, allowing it to terminate the program.