Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
```
the arbitrator will have the authority to grant motions dispositive of all or part of any claim or dispute . 

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