A Primary-Caregiver System for a Child Consists of One Primary

A primary-caregiver system for a child consists of one primary caregiver and at least one other caregiver who is familiar with the child.This system is important _____.

A) for children's sense of security
B) for smooth transitions when the primary caregiver is absent
C) to promote attachment and not leave it to chance
D) All of the answers are correct.