To have mutually exclusive radio buttons, we can add a `name` attribute to them. For example:
```
<input type="radio" name="apn" value="carrier1">
<input type="radio" name="apn" value="carrier2">
<input type="radio" name="apn" value="carrier3">
```

Then in this function we can simply do:
`apnList.querySelectorAll('input[type="radio"][value="' + carrier + '"]').checked = true;`