Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
if you choose to cancel your account , contact privacyct@fb.com . 

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