Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you must choose an account name for your account which may also serve as the name for your graphical representation within each product ( your `` avatar '' ) . 

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