C Programming

a) What is the difference between rb and r+b wb and w+b ab and a+b b) Find, explain, and correct the error(s) in the following code fragment. "wb; Char fileName 19" iPayroll"; RECORD pay; RECORD *list = (RECORD *) malloc(10 + sizeof(RECORD)); FILE *fp; fp = fopen (fileName, mode); fread(pay, sizeof(pay), 1, fp); fread(list, sizeof(list), 25, fp); fclose(fp)