Problem 3: Developa Cprogram that processes a file called "grades.txt" containing a list of student grades and outputs the percent of A, B, C, and Ds. Your program should make use the following function prototype void gradeDist (FILE inp, int "p_A, int p_B, int "p C, int PD) In gradeDist, inp is a variable that points to the grades.txt file, and the four int pointers point to variables in the main that hold the A, B, C, and D percentages. Sample Output nput File: ABABAACBAABACDCDABAA Output: A:50% B: 25% C: 15% D: 10%