Triple

Target class: artificially contained black hole
Context triple: [Eye of Harmony, instanceOf, artificially contained black hole]

• A. non-singular black hole model
  A non-singular black hole model is a theoretical description of a black hole whose core avoids the classical spacetime singularity, typically by invoking modified gravity or quantum effects that yield a finite, regular interior geometry.
• B. black hole uniqueness theorem
  The black hole uniqueness theorem states that any stationary, asymptotically flat black hole solution of the Einstein–Maxwell equations in four dimensions is completely characterized by only three externally observable parameters: mass, electric charge, and angular momentum.
• C. hypothetical megastructure concept chosen
  A hypothetical megastructure concept is an immense, often star- or system-spanning engineered construct envisioned to harness, manage, or transform vast amounts of energy, matter, or space on a civilizational scale.
• D. Eddington–Finkelstein coordinate system
  The Eddington–Finkelstein coordinate system is a reformulation of the Schwarzschild spacetime using null (lightlike) coordinates that smoothly extend across the event horizon, eliminating the coordinate singularity present in standard Schwarzschild coordinates.
• E. Penrose diagram
  A Penrose diagram is a spacetime diagram used in general relativity that compactifies infinite regions to finite size, allowing the global causal structure of a spacetime to be visualized.
• F. None of above.