Economic infrastructure refers to the basic physical and organizational structures needed for the operation of a society or enterprise, such as transportation, communication, banking, and power. In this question, all of these options are correct and fall under the category of economic infrastructure.

Communication:
Communication involves the exchange of information and ideas between individuals, organizations, or countries. This includes various means of communication such as telephone, email, internet, and postal services. Communication infrastructure is essential for the smooth functioning of businesses, governments, and individuals.

Banking:
Banking infrastructure includes financial institutions, such as banks, which provide various financial services such as loans, deposits, and investments. Banks play a crucial role in the economy by facilitating transactions, managing risks, and providing financial support to businesses and individuals.

Power:
Power infrastructure includes the generation, transmission, and distribution of electricity. This infrastructure is essential for the functioning of businesses, governments, and households. It is necessary for running various appliances, machinery, and equipment, as well as for lighting and heating homes and offices.

All of these:
All of the above options are crucial components of economic infrastructure. Without communication, banking, and power infrastructure, the economy cannot function efficiently. These infrastructures support various economic activities and facilitate the smooth functioning of businesses, governments, and individuals.