Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
to meet the cancellation deadline , it is sufficient for you to send your communication concerning your exercise of the right to cancel before the cancellation period has expired . 

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