Final answer:
Point-to-Point Fixed Wireless access technology requires line of sight access and is used to provide Internet access to multi-tenant buildings. It operates on microwave frequencies and is selected for its capacity to transmit large amounts of data efficiently.
Step-by-step explanation:
The type of Fixed Wireless access technology that requires "line of sight" access between transmitters and is commonly used to provide Internet access to multi-tenant buildings is C) Point-to-Point. This method of communication uses microwave frequencies and is suitable for high-frequency communications due to its ability to carry more information per unit of time. It's important for there to be a clear line of sight between the transmitter and receiver because microwaves have short wavelengths that do not bend around obstacles well, making direct paths necessary for reliable transmission.