In SIM media, what three traits are assessed and how would a positive result appear for each?

• A. Motility (turbid diffuse growth); H2S production (blackening); Indole production (red ring after Kovac's).
• B. Motility (turbid, localized growth); H2S production (no blackening); Indole production (no Kovac's color).
• C. Motility (no growth); H2S production (blackening); Indole production (red ring).
• D. Motility (diffuse growth with color change); H2S production (green precipitate); Indole production (blue ring).

Answer: (A)