Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
arbitrators must disclose any bias , interest in the result of the arbitration , or relationship with any party ; 

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