Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
a security deposit , if required by a host , may be applied to any overstay fees due for a guest 's overstay . 

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