Which of the following statements is true concerning phototrophy among haloarchaea, cyanobacteria, green-sulfur bacteria, and purple-nonsulfur bacteria?
A. Haloarchaea: bacteriochlorophyll-based phototrophs that absorb green light.
B. Cyanobacteria: anoxygenic photosynthesizers.
C. Purple-nonsulfur bacteria: light absorption via bacteriorhodopsin linked to a proton pump.
D. Green-sulfur bacteria: phototrophs possessing photosystem | (P51) linked to NADPH/NADH formation.
E. None are true, A-D are all false.