Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
( d ) we may charge you a reasonable service charge to mail you a paper copy of any communication . 

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