Final answer:
In the oil and gas industry, companies/business units can focus on different sectors, including upstream, downstream, and midstream.
Step-by-step explanation:
In the oil and gas industry, the focus of a company/business unit can fall under different sectors depending on its activities. One sector is the upstream sector, which involves activities such as exploration and production of oil and gas reserves. The downstream sector focuses on activities such as refining, processing, and distribution of the oil and gas products. Another sector is the midstream sector, which involves activities such as transportation and storage of oil and gas products.