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