After Ms$.$ Katie substituted in a $3$rd grade classroom, the father of one of the students came up to her at soccer practice and asked $"$My son is in the class that you were in the other day. How was he doing with his reading? Do you think that he is up to grade level and is getting the help he needs?" What is the BEST way for Ms$.$ Katie to respond?

$"$It was great to be in your son's class. He did really well on the two reading assignments I saw so I$\text{'}$d say he's at grade level."

"I was only there for two days so I don't really have insight into your son's performance. He seemed to be doing well, but you should ask his teacher."

$"$I$\text{'}$m not able to discuss the progress of the students I work with. I recommend contacting the classroom teacher with your concerns or questions."

$$ "It's really out of line for you to ask me about my knowledge of your son's progress. Please don't approach me again to ask about my teaching."