Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
after you place an order , you may receive a communication from us acknowledging that we have received your order ( `` order acknowledgement '' ) . 

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