Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
airbnb reserves the right to require that listings have a minimum number of images of a certain format , size and resolution . 

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