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 starb.  night-by-night photography of nearby stars at hydrogen balmer wavelengthsc.  continuous radio and microwave listening and transmitting at frequencies at which the natural radio sky noise background is lowd.  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