Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
gifting codes can only be used once in the country for which they were purchased and can not be redeemed for cash , resold or combined with any other offers , including free trial . 

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