Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
your notice to us must be sent to : linden research , inc. , 945 battery street , san francisco , ca 94111 , attention : general counsel . 

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