Generally, environment can be classified as following categories. Which among the following is NOT a part of such category?

1. A

   Operational Environment

   Operational environment is not a standard first-order class of ‘the environment’ in this geography/ecology framing. Physical, biological and cultural/social are. That is the official key.

2. B

   Physical Environment

   Physical environment (landforms, climate, water, soils) is a core category.

3. C

   Cultural Environment

   Cultural environment (institutions, technology, beliefs) is a recognised human-environment class.

4. D

   Biological Environment

   Biological environment (plants, animals, microbes) is the biotic category.

Summary. Official key is (a). Textbook environment splits into natural (physical + biological) and human/cultural. ‘Operational’ is management jargon, not that triad. Honour the stored letter (a).