Final answer:
Ainsworth proposed three attachment classifications: secure, avoidant, and resistant. Secure attachment is the healthiest type, while avoidant attachment is characterized by indifference, and resistant attachment involves clingy behavior.
Step-by-step explanation:
Ainsworth proposed three attachment classifications: secure, avoidant, and resistant. Secure attachment is the healthiest type, in which the child prefers the parent over a stranger, uses the parent as a secure base, and seeks comfort in times of stress. Avoidant attachment is characterized by the child being unresponsive to the parent, not using the parent as a secure base, and showing indifference during separation and reunion. Resistant attachment involves clingy behavior, but rejection of the parent's attempts to interact, and extreme distress during separation and difficulty in being comforted upon reunion.