Step 1: Understanding probiotics.
Probiotics are live microorganisms that provide health benefits when consumed in adequate amounts. The common types of probiotics include Lactobacillus, Saccharomyces boulardii, and Bifidobacterium. Zymomonas is not typically used as a probioti(C)
Step 2: Conclusion.
Thus, the correct answer is (A), (B), and (C) only.
Final Answer:
\[
\boxed{2. (A), (B) and (C) only}
\]