Which of the following segments will call the method readData four times?

a) ```
int k;
k = 1;
while (k < 4)
{
readData();
k = k + 1;
}
b)
``````
int i;
i = 0;
while (i <= 4)
{
readData();
i = i + 1;
}
```
c)```
int i;
i = 0;
while (i < 4)
{
readData();
}
```
d) ```
int i;
i = 0;
while (i < 4)
{
readData();
i = i + 1;
}
```

d)```
int i;
i = 0;
while (i < 4)
{
readData();
i = i + 1;
}
```