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Before Dark Energy could be discovered, several preconditions needed to be in place. Tick all the factors below which were necessary for the discovery of dark energy.

Radio interferometers, Large telescopes such as Keck, Knowledge of the correlation between peak brightness and duration for Type 1a supernovae, Knowledge that Type 1a supernovae come from white dwarf explosions , - incorrect Large format detectors for wide field imagingRadio interferometersLarge telescopes such as KeckKnowledge of the correlation between peak brightness and duration for Type 1a supernovaeKnowledge that Type 1a supernovae come from white dwarf explosions

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