Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
we may give notice to you at the e-mail address you provide to us when you register , or in any of the ways specified in section 13.7 above . 

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