Identify the unfair aspect with respect to the sentence extracted from an online Terms of Service:
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( c ) please note that if you purchase a subscription through the apple itunes store or our iphone application , you may cancel your subscription by cancelling automatic renewal of paid in app subscriptions by selecting manage app subscriptions in your itunes account settings and selecting the subscription you want to modify . 

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