Final answer:
Mary Ainsworth and Mary Main identified four attachment styles: secure, avoidant, resistant, and disorganized. Secure attachment is the most common and considered the healthiest.
Step-by-step explanation:
Mary Ainsworth and Mary Main identified four attachment styles: secure, avoidant, resistant, and disorganized. Secure attachment is the most common and considered the healthiest type of attachment. In this style, the child prefers the parent over a stranger, uses the parent as a secure base to explore the environment, and seeks the parent for comfort in times of stress. Disorganized attachment is the least common style and is characterized by inconsistent and unpredictable behavior.