שאלה | For dolphins: what does the "group cohesion hypothesis" predict?

For dolphins: what does the "group cohesion hypothesis" predict?

		Signature whistles occur only during separations, and not in novel and threatening situations, when group cohesion is particularly important
		When a group of dolphins is together, the cohesion of the group causes the dolphins to stop producing signature whistles
		Signature whistles occur primarily during separations, and also in novel and threatening situations, when group cohesion is particularly important
		When a group of dolphins is together, the cohesion of the group causes the dolphins to increase their use of signature whistles