What strategies and electromagnetic frequencies are thought to be the MOST logical for long-range communication across the universe with other intelligent beings?
A) explosion of nuclear devices at specific intervals and in specific patterns across Earth when we are closest to a nearby star
B) night-by-night photography of nearby stars at hydrogen Balmer wavelengths
C) continuous radio and microwave listening and transmitting at frequencies at which the natural radio sky noise background is low
D) X-ray surveys of space at appropriate times (e.g., when Earth is closest to nearby stars in its orbit) , in view of the penetrability of space at these wavelengths
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