"Darwin," a Space Telescope System to Be Launched Sometime After

Multiple Choice

"Darwin," a space telescope system to be launched sometime after the year 2015,will consist of

A) two spacecraft launched in opposite directions to visit a succession of solar-type stars over the next 2500 years and return images of all planets that they find.
B) four 40-m-diameter radio telescopes equally spaced in orbit around the Sun,acting as a radio interferometer 1.25 AU in radius.
C) a single 16-m-diameter telescope designed to image planets around other stars at optical and infrared wavelengths.
D) three 3-m-diameter telescopes linked together as an infrared interferometer.