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_____ of returns is a method of measuring an investment risk.
Coaxial
A type of electrical cable consisting of a central conductor surrounded by an insulating layer and an outer conducting shield, widely used for transmitting television, telephone, and internet signals.
Microwave
Electromagnetic waves with wavelengths shorter than one meter but longer than one millimeter, used in cooking, communication technologies, and radar.
Radio
A technology that uses radio waves to carry information, such as sound, by systematically modulating some property of electromagnetic energy waves transmitted through space.
Broadcast Medium
A communication channel that disseminates information, such as audio or visual content, to a wide audience simultaneously.
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