What Is a Lenticular (Or S0)galaxy

What is a lenticular (or S0) galaxy?

A) a galaxy with a central bulge and a disk like a spiral galaxy, but with no spiral arms
B) a galaxy with a smooth brightness profile and lacking the central bulge and disk of a spiral galaxy
C) a galaxy with a lot of gas and dust and no particular structure
D) a spiral galaxy with fuzzy and poorly formed spiral arms

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