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", "Unilateral termination", "Jurisdiction", "Contract by using", "Arbitration", "None", "Unilateral change", "Content removal", "Choice of law"].