How does the behavior of securely attached infants differ from that of insecurely attached infants? (4)
a) Securely attached infants show distress when separated from their caregivers, while insecurely attached infants do not
b) Securely attached infants are indifferent to their caregivers, while insecurely attached infants seek proximity to them
c) Securely attached infants exhibit aggressive behavior towards their caregivers, while insecurely attached infants are calm
d) Securely attached infants avoid contact with their caregivers, while insecurely attached infants seek constant reassurance.