Which of the following are acceptable Fischer projections for S-alanine, NH2CH(CH3) COOH? 
Definitions:
Water Molecule
A molecule consisting of two hydrogen atoms bonded to one oxygen atom, represented chemically as H2O.
Molecular Shape
The three-dimensional arrangement of atoms within a molecule, determined by the chemical bonds and electron pairs surrounding the central atom.
Carbon Monoxide
A colorless, odorless, and toxic gas, consisting of one carbon atom and one oxygen atom.
Geometry
The branch of mathematics concerned with the properties and relations of points, lines, surfaces, and solids.
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