A mother sees her 4-year-old boy masturbating. She expresses concern about this to the PMHNP and says she wants to know if he has been sexually abused. What is the most appropriate response?

"Yes, this is a clear sign he has been abused. I need to call Child Protective Services."

"It's possible he has been abused. Bring him in and let me evaluate him."

"This is part of a normal developmental stage for a child his age."

"Have you ever left him in a place where he could have been abused?"