Evaluate the different types of acid producers in industrial settings.
a. Aspergillus niger is a fungus that produces citric acid.
b. Acetobacter aceti is a bacterium that produces acetic acid.
c. Clostridium butylicum is a bacterium that produces butyric acid.
d. Lactobacillus is a bacterium that produces lactic acid.
e. All the listed microbes are single-celled protozoans.
