Final answer:
Public Utilities is a service business within the industrial market that provides essential services such as electricity, gas, water, and telecommunications.
Step-by-step explanation:
The service business within the industrial market is Public Utilities.
Public utilities are companies that provide essential services, such as electricity, gas, water, and telecommunications, to the public. These services are usually regulated by the government and are necessary for daily life and economic activities.
Examples of public utilities include electric power companies, natural gas suppliers, water companies, and telephone and internet service providers.