Angie's mother allows her to schedule her study and relaxation time on her own and, in turn, expects Angie to continue doing well in school and to discuss her activities with her mother ahead of time. Her mother checks on her school progress frequently, and also talks to her about her problems and her social life. This approach is called:________.
a. boundary ambiguity
b. latchkey control
c. unilateral control
d. coregulation