Which of the following should be used to make the code snippet work for students who get any score between 0 – 100?

```
var grade = 0;
var score = parseInt("What's the score?");
if (score < 70)
grade = "F";
else if ( ??? )
grade = "C";
else if (grade >= 85)
grade = "A";
```
a.
```
grade > 70 && grade < 85
```
b.
```
grade >= 70 && <= 85
```
c.
```
grade >= 70
```
d.
```
grade < 85
```

d.
```
grade < 85
```