Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
if you do so , neither you nor headspace can force the other to arbitrate . 

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