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