Final answer:
The attachment system between an infant and a caregiver serves to provide cognitive stimulation, behavior control, and protection, all of which are essential for healthy social and emotional development in childhood and beyond.
Step-by-step explanation:
The attachment system between an infant and a caregiver serves several essential functions in a child's development. Among the possible options provided, the three purposes served by the infant-caregiver attachment include cognitive stimulation, behavior control, and protection. Cognitive stimulation is facilitated through responsive interactions with the caregiver, which nurtures the child's developing brain. Behavior control is related to the guidance and the responsive care the caregiver provides, helping the infant learn to regulate emotions and actions. Protection is offered by the caregiver's presence, offering a sense of safety and security which is foundational for exploring the environment and learning.