; or (II) rebut any evidence or factual or legal claim; and (ii) the actions or circumstances are not subject to exclusion under rule 403 of the Federal Rules of Evidence. (B) Notice In a civil action brought under subsection (a), a plaintiff seeking to introduce evidence of actions or circumstances under subparagraph (A) of this paragraph shall— (i) provide reasonable notice— (I) in writing before trial; or (II) in any form during trial if the court, for good cause, excuses lack of pretrial notice; and (ii) articulate in the notice described in clause (i) the permitted purpose for which the plaintiff intends to offer the evidence and the reasoning that supports the purpose. (h) Defense In a claim under subsection (a)(2) involving knowing conduct, it shall be a defense, which the provider of an interactive computer service must establish by a preponderance of the evidence, that— (1) the provider disabled access to or removed the child pornography within a reasonable timeframe, and in any event not later than 48 hours after obtaining knowledge that the child pornography was being hosted, stored, or made available by the provider (or, in the case of a provider that, for the most recent calendar year, averaged fewer than 10,000,000 active users on a monthly basis in the United States, within a reasonable timeframe, and in any event not later than 2 business days after obtaining such knowledge); or (2) the provider— (A) exercised a reasonable, good faith effort to disable access to or remove the child pornography but was unable to do so for reasons outside the provider’s control