Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
parents or legal guardians must supervise their children 's use of the nintendo account at all times . 

```
. OPTIONS: ['Content removal' 'Arbitration' 'Jurisdiction' 'Limitation of liability'
 'None' 'Unilateral termination' 'Contract by using' 'Unilateral change'
 'Choice of law'].