Attorney Ann represents Client X in a contract dispute against Company Y. During representation, Ann learns highly confidential information about X's financial weaknesses. After the matter concludes, Company Y asks Ann to represent it in a new, unrelated trademark matter. Under the Model Rules of Professional Conduct, Ann:
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A
May represent Company Y without restriction because the new matter is unrelated to the prior representation of X
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B
Must decline unless she obtains informed written consent from X, because the prior representation creates a conflict under Rule 1.9
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C
Must decline outright and cannot represent Company Y even with consent, because she possesses X's confidential information
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D
May represent Company Y only if she discloses X's confidential information to Company Y to ensure fairness