Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
cancellation is effective at the end of the applicable monthly period . 

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