A train traveling very fast $($v $=0\mathrm{.}6$c$)$ has an engineer $($E$)$ at the front, a guard $($G$)$ at the rear

and a passenger $($S$\text{'})$ exactly half way between them. Both E and G are equipped with yellow

signaling lamps. The train passes a station, closely observed by the station master $($S$).$ Both E

and G use their lamps to send signals. According to both S and S$\text{'}$ these signals arrive

simultaneously at the instant S$\text{'}$ is passing S$.$ According to S$,$ the signal from E will look $\_\_\_\_\_\_$

and that from G will look $\_\_\_\_\_$:

A$)$ red, blue

B$)$ yellow, yellow

C$)$ blue, red

D$)$ blue, blue

E$)$ red, red