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