(Pseudocode and modules)Design a grade program that directs the user to enter information for one student. The user inputs the first name, last name, and three grades. The three grades MUST be entered into an array. Validate the grade input so that only grades between 0 and 100 are accepted. The program should display four output lines. One containing the student’s first and last name separated by a space One containing all three grades One containing the final average One containing the letter grade The program must calculate the final average. The letter grade is determined using the following ranges: A: 90-100 B: 80-89 C: 70-79 D: 60-69 F: Below 60