Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
you are solely responsible for all activities conducted through your account whether or not you authorize the activity ( except to the extent that activities occur because someone gains access to our system without using your identifiers and password ) . 

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