The program's effect can best be described as __________.
```
char r, x, y, z, w;
scanf("%c%c%c%c", &x, &y, &z, &w);
if (x < y)
r = x;
else
r = y;
if (r > z)
r = z;
if (r > w)
r = w;
printf("%c\n", r);
```
a. It displays the letter 'r' after comparing it to x, y, and z.
b. Of the four input characters, it displays the one that comes first in the alphabet.
c. Of the four input characters, it displays the one that comes last in the alphabet.
d. Of the four input characters, it displays the one that comes second in the alphabet.
e. It displays nothing since characters cannot be compared
b. Of the four input characters, it displays the one that comes first in the alphabet.
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