Write a program that prompts the user to input a student's score $($an integer between $0$ and $100).$ The program should then classify the score into one of four grade categories using an enumeration: $-$ EXCELLENT for scores between $80$ and $100,-$ GOOD for scores between $60$ and $79,-$ AVERAGE for scores between $40$ and $59,-$ POOR for scores below $40.$ If the input score is not within the valid range $(0100),$ the program should classify it as INVALID$\_$SCORE. Use a namespace called GradeSystem to store the enumeration and the function grade$\_$category$()$ The function should take the user's input score, classify it$,$ and print the corresponding grade category in a user$-$friendly$$messageWrite a program that prompts the user to input a student's score $($an integer between $0$ and $100).$ The program should then classify the score into one of four grade categories using an enumeration: $-$ EXCELLENT for scores between $80$ and $100,-$ GOOD for scores between $60$ and $79,-$ AVERAGE for scores between $40$ and $59,-$ POOR for scores below $40.$ If the input score is not within the valid range $(0100),$ the program should classify it as INVALID$\_$SCORE. Use a namespace called GradeSystem to store the enumeration and the function grade$\_$category$()$ The function should take the user's input score, classify it$,$ and print the corresponding grade category in a user$-$friendly$$message