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Final answer:Packaged water-source heat pumps are normally located inside the building and are devices that transfer heat from a cooler to a warmer environment. They are energy-efficient as they can extract heat from the outside air, even when it is cold, and are also used for cooling in summer. so, option a is the correct answer.Explanation:Packaged water-source heat pumps are typically located inside the building. A heat pump is a device that transfers heat energy from a source of heat to what is called a heat sink. Heat pumps move thermal energy in the opposite direction of spontaneous heat transfer by absorbing heat from a cold space and releasing it to a warmer one, using work to accomplish this process.A key advantage of using a heat pump over conventional heating methods, such as burning fuel like in a fireplace, is its ability to transfer energy by heat from the cold outside air or from the energy generated by work done, without the direct use of an external heat source. This makes heat pumps typically more energy-efficient, especially in moderate climates.Moreover, in a reverse setting, heat pumps can be used to cool rooms in the summer by transferring heat outdoors from inside a home. Packaged water-source heat pumps are normally located inside the building. These heat pumps are designed to provide heating and cooling for a building by using water as the heat transfer medium. The heat pump unit is installed inside the building, allowing for easy access and maintenance....