Final answer:
The correct answer is option 4) use a validated screening tool to ensure that all aspects of behaviours are evaluated.
Step-by-step explanation:
The initial approach to ascertain whether a preschool aged child has a mental health disorder, in light of their behavioral problems at school, would lean towards using a validated screening tool. This method ensures that all aspects of the child's behavior are comprehensively evaluated. While taking into account the perspectives of the parents and other caregivers is crucial, a standardized assessment tool allows for an objective analysis. During this developmental stage, as theorized by Erikson, children aim to resolve the task of initiative versus guilt.
Thus, it is important to evaluate how the child's social interactions and achievements at school may be affected by their environment and personal development. In addition to utilizing screening tools, it would be important to gather observational data from teachers and other school personnel, who have seen the child in various social situations and can provide valuable insight into the child's peer relations and behavior. Also, comprehending family dynamics and communication patterns is critical as they could impact the child's presentation and behavior.