The Fundamental Plane Technique for Ellipticals Can Be Used to Determine

The fundamental plane technique for ellipticals can be used to determine galaxies at greater distances than the Tully-Fisher relation that is applied to spirals. Why?

A) The fundamental plane technique is not affected by interstellar reddening while the Tully-Fisher relation is.
B) Ellipticals rotate faster than spirals.
C) The brightest ellipticals are brighter than the brightest spirals.
D) Ellipticals exist in the farthest galaxy clusters. Spirals exist only in relatively nearby clusters.

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