Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
- signature of consumer ( s ) ( only if this form is notified on paper ) , 

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