What is the program output if the user types runt followed by a carriage return when the program is run?
```
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. r
b. u
c. n
d. t
e. none of the above
c. n
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