Which law established Option I and Option II for the substantial part test?

Question

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The 1976 Lobby Law, officially known as the Lobbying Disclosure Act (LDA), established both Option I and Option II for the substantial part test. Option I specifies that no substantial part of an organization's activities can consist of attempting to influence legislation, while Option II allows organizations to devote a substantial part of their activities to lobbying as long as it is not their primary activity.

Which Law Established Option I and Option II for the Substantial