Answer: d. classification schemes for prokaryotes
Explanation:
Bergey’s manual of systematic bacteriology is the main resource for identifying the prokaryotic organisms, the main emphasis is over the bacterial species. This manual uses every characterizing aspect for classifying the organisms specially the bacteria. It is includes the classifying schemes to identify all unknown prokaryotes.
It was published by David Hendrick Bergey 1923 which describes the functional and structural features for arranging and classifying the organisms in the specific familial orders.