Which of the following would be considered a sign of secure attachment in a 1 -year-old?
a. Showing no sign of stranger anxiety, whether the parent is present or not
b. Paying no attention to a parent who returns after a brief separation
c. Showing anger at the parent after a brief separation
d. Becoming distressed when the parent leaves and seeking contact on return
e. Not reacting to a parent leaving or returning after a brief separation