Identifying Secure Attachment in Infants

In developmental psychology, social development involves the formation of relationships and understanding social cues, which can vary greatly among individuals. One influential component of social development is the concept of attachment, which has profound implications on future relationships. Researchers have explored various attachment styles and their impact on later interactions. Based on attachment theory, which of the following attachment styles is characterized by infants displaying significant distress upon separation from their caregiver and warmth upon reunion?