Betty and Allen are part of a theatrical group, so they travel frequently. Their child, Cara, is an 11-month-old baby and travels everywhere with them. Even though Cara is usually comfortable with strangers, a full-time nanny, who Cara grew fond of in a day, helps take care of her when her parents are performing. Cara has a regular routine but easily adapts to new eating and sleeping habits whenever the family moves across states. According to Chess and Thomas, Cara would be classified as