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