Question: choose the correct answer for the following question and explain: Which of the following could be an observable or detectable manifestation of a civilization far

choose the correct answer for the following question and explain: Which of the following could be an observable or detectable manifestation of a civilization far in advance of our own? a very narrow-band radio signal that fluctuates in its intensity a Dyson sphere (an infrared-emitting shroud surrounding a star) all of the above a modulated beacon of electromagnetic radiation that repeats a complex pattern placement of a physical artifact somewhere in our solar system

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