Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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therefore , you should make whatever investigation you feel is necessary or appropriate before proceeding with any transaction with any third party to determine whether a charge will be incurred . 

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