What kind of claims does Rule 20 address in terms of joinder?

Rule 20 governs the permissive joinder of parties and specifically outlines conditions under which multiple plaintiffs or defendants may be joined in a single action. The primary focus of Rule 20 is on the relationship between the claims and their connection to the underlying events that give rise to the lawsuit.

When a claim arises from the same transaction or occurrence, it indicates a logical relationship that allows for the efficient resolution of related disputes. By allowing such claims to be joined, Rule 20 promotes judicial efficiency and the fair and consistent handling of related legal issues in one trial, rather than requiring multiple, potentially conflicting outcomes in separate trials.

The other possible claims listed in the options—such as those solely concerning co-defendants, varying jurisdictional amounts, or different jurisdictions—do not capture the essence of what Rule 20 is designed to address. The emphasis on claims arising from the same transaction or occurrence is crucial because it emphasizes the uniform treatment of claims that are connected and ensures that the legal process remains efficient and comprehensive.