Which of the following is the proper way to dynamically access the border width from within the script?

a.
```
document.body.style.BorderWidth
```
b.
```
document.body.attributes.border-width
```
c.
```
document.body.style.border-width
```
d.
```
document.body.style.borderWidth
```

d.
```
document.body.style.borderWidth
```