Final answer:
The question lacks context and specificity, making it impossible to provide an accurate answer or classify it by subject or grade level. More information is needed to appropriately address the question.
Step-by-step explanation:
The question 'Original Members and Date Joined (12)' is incomplete and lacks sufficient context to be classified within a specific subject or education level. It might refer to a variety of topics, such as the founding members of an organization, band, or country, or it could pertain to the initial signatories or states of a treaty or alliance in history. The information provided does not allow for a detailed answer or the identification of SEO keywords. To offer an accurate and helpful response, additional information regarding the context of 'Original Members and Date Joined' is required.