Example of Gum Producing Bacteria is

Azotobacter, Beijerinickia and Rhizobium all the given options are an example of Gum producing Bacteria.
The gums produced by bacteria are polysaccharides, high molecular weight polymers that are produced by the cell-wall anchored enzymes of microorganisms. The gums are composed of sugar residues linked by glycosidic linkages and may be linear or highly branched.