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