What type of rescue should be used when a responsive guest of any size is beneath the surface but within arm's reach?

In a scenario where a guest is responsive and within arm's reach but submerged, the most appropriate type of rescue is the duck pluck. This technique is designed for situations where the lifeguard can physically reach the individual without having to enter the water, enabling a swift and immediate response. The duck pluck involves the rescuer using their arms to reach under the person's armpits and lift them out of the water, providing prompt assistance while minimizing the risk to both the lifeguard and the guest.

In contrast, the other options serve different purposes. A reach rescue typically involves extending a rescue aid, such as a pole or other device, to assist someone who is close to the edge but not submerged. Throw rescue involves tossing a flotation device to a person in distress who is not within arm's reach, which may take longer and requires the guest to be able to grasp the object. Deep-water rescue is reserved for circumstances where a lifeguard must enter the water to reach a submerged or struggling individual, which would not be necessary if the guest is within arm's reach.