3- Write the necessary codes starting from the dashed lines below for the given C program which finds the maximum number in the given two dimensional array using ptr. #include int main(void) { int num[3][4] = { {10, 2, 3, 4}, {75, 46, 7, 108). {9.1. 11, 12) }; int *ptr = &num[0][0]; } 4- Write a function na() which counts total number of the character 'a' in a given string s: Your function na, may be called from the main function. Its prototype is: int na(char *ptr); End of document