At Present,what Is the Primary Way That the Search for Extraterrestrial

Multiple Choice

At present,what is the primary way that the search for extraterrestrial intelligence (SETI) is carried out?

A) by using radio telescopes to search for signals from extraterrestrial civilizations
B) by analyzing high-resolution images of nearby stars in search of evidence for structures that could not have developed naturally
C) by searching for planets around distant stars
D) by using X-ray telescopes to search for exhaust from interstellar spacecraft
E) by seeking access to the secret records and alien corpses kept at the military's Area 51 in Nevada