In What Way Is the SETI@home Program Helping to Search

In what way is the SETI@home program helping to search for radio signals from intelligent life forms elsewhere in our universe?

A) More than a million personal computers analyze data from radio telescopes sent to them from the University of California when otherwise these computers would sit idle.
B) Thousands of people with satellite dish antennas for TV reception have donated time on their receivers to collect radio signals from selected regions of space.
C) Thousands of dedicated amateur astronomers are each spending hundreds of hours searching the space around nearby stars suspected of having planets,looking for bright flashes from possible nuclear explosions on these planets.
D) Hundreds of people are using their cell phones to listen for extraterrestrials.