What type of current is illustrated in the diagram below? 
Definitions:
Documents
Written, drawn, presented, or memorialized representations of thoughts.
Case-or-Controversy Requirement
A constitutional principle that federal courts can only hear actual, ongoing cases or controversies, ensuring that courts do not overstep their boundaries into the realm of advisory opinions.
Advisory Opinions
Non-binding judgments given by courts or legal authorities on questions of law or policy, often requested before formal legal action is commenced.
Courts
Governmental institutions authorized to hear and decide on legal disputes and administer justice in legal cases.
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