$(60$ pts$)($Chapter $7)$ Grade Book $($utilize array notations$)$ C$++$

A teacher is assessing five students, each of whom has completed four tests. The grading scale

used assigns a letter grade based on the average of their four test scores:

$90-100$: $A$

$80-89$: $B$

$70-79$: $C$

$60-69$: $D$

$0-59$:$F$

To facilitate this grading process, a program has been designed. It employs an array of string

objects to store the names of the five students, an array of characters to store their

corresponding letter grades, an array of the average score, and a two$-$dimensional array to

store the students' test scores.

The program prompts the user to input each student's name and their four test scores.

Subsequently, it displays each student's dropped score, calculates the average test score, and

assigns a letter grade based on the average. The display includes the average score and

dropped score, presented with two decimal places. To ensure accuracy, the program excludes

each student's lowest score when calculating both the average and the letter grade.

Importantly, the program incorporates input validation to reject test scores that are less than $0$

or greater than $100.$