An attorney's fee agreement states that the attorney's hourly rate may increase during the representation without additional client consent. Under the Model Rules, such a provision is:
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A
Always enforceable because the client signed the fee agreement.
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B
Permissible only if the rate increases are tied to an objective index.
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C
Permissible if adequately disclosed in the original written agreement and any increase still results in a reasonable fee.
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D
Always impermissible because fee changes require a new written agreement signed by the client.