rio t rio; char buf [MAXLINE] int fd1 = open ( "hw3b.txt", ORDONLY); Rio readinitb (&rio, fdl); while ((n = Rioreadlineb ( & rio, buf, MAX LINE)) //Linel //Line2 !.. 0) - Rio writen (STDOUT FILENO, buf, n)i Fill in the following table to trace the code after its execution line by line: nprio cnt rp-rio bufptr rp->rio buf buf [MAXLINE Line # Line l Line2 iteration 1 Line2 iteration 2 Line2 iteration 3 Assume the file "hw3b.txt" contains: ABCDEFGHIJK LMNOPORSTUV WXYZ