2. (20 points) Here are four C programs to translate binary to decimal; that is, you run './pb 101 ' and it will print ' 5 '. For each program, indicate whether it works. If it does not, show how to fix it by changing the fewest characters possible. Note that these programs will crash if not given an argument; that's not considered an error per the design spec. Program A Works as is. Needs fixing. \#include \#include \#include int main(int argc,charargv[]) \{ int val=0; // warning: assumes argv[1]! int len =strlen(argv[1]); for (int i=0;i=1; if (argv[1][i]==1, ) val=1; \} printf("d ", val); \} Program B Works as is. Needs fixing. \#include \#include \#include int main(int argc,charargv[]) \{ int val=0; // warning: assumes argv[1]! int len =strlen(argv[1]); for (int i=0;i=0; i--) \{ if (argv[1][i]==1 ', val =1 len - i; \} printf("\%d ", val); \} Program D Works as is. Needs fixing. \#include \#include \#include int main(int argc,charargv[]) \{ int val=0; // warning: assumes argv[1]! int len =strlen(argv[1])1; for (int i=1 len; i>0; i--) \{ val+=(argv[1][i]0 ' )