Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
refunds can not be claimed for any partial-month subscription period . 

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