The correct answer is A.

UC has three Lead sources: web, trade shows, and partners. Some Lead information is common to all, while other fields are unique to each source. The best configuration is to use Lead record types with separate page layouts so each type of Lead shows the fields relevant to that process. Salesforce documentation states that record types allow different business processes, picklist values, and page layouts for different users or record categories.

B is not ideal because it leaves irrelevant fields visible and relies on users to collapse sections. C unnecessarily creates a different Lead object for the partner community. D is incorrect because separate custom objects would fragment Lead management and prevent standard Lead functionality from being used consistently.

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