While Traveling the Galaxy in a Spacecraft,you and a Colleague

While traveling the galaxy in a spacecraft,you and a colleague set out to investigate the 10⁶-M¤ black hole at the center of our galaxy.Your colleague hops aboard an escape pod and drops into a circular orbit around the black hole,maintaining a distance of 1 AU,while you remain much farther away in the spacecraft but from which you can easily monitor your colleague.After doing some experiments to measure the strength of gravity,your colleague signals the results back to you using a green laser.What would you see?

A) the signals, because he or she is orbiting well outside the event horizon
B) the signals, but shifted to a much redder wavelength because he or she is very close to the event horizon
C) nothing, because your colleague has crossed the event horizon
D) nothing, because no light can escape the gravitational pull of a black hole no matter how close the signal is to it

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