Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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4.5 you are responsible for maintaining the confidentiality and security of your airbnb account credentials and may not disclose your credentials to any third party . 

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