Mary Ainsworth developed the Strange Situation as an assessment of parent.infant attachment. She observed that securely attached infants ____
a. do not seem to care when the mother leaves the room and do not see her out when she returns b.cry if the mother leaves the room and welcome her back when she returres
c. are not concerned when the mother awes, but cry to be picked up when she returns d. protest loudly when the mother leaves, but resist contact with her when she returns