What Strategies and Electromagnetic Frequencies Are Thought to Be the Most

Multiple Choice

What strategies and electromagnetic frequencies are thought to be the most logical for long-range communication across the universe with other intelligent beings?

A) Night-by-night photography of nearby stars at hydrogen wavelengths
B) 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.
C) Explosion of nuclear devices at specific intervals and in specific patterns across Earth when it is closest to a nearby star
D) Continuous radio and microwave monitoring at specific frequencies at which the sky noise is low