Mia : “Tia, do you remember what our class teacher said yesterday?”

Tia : "Sure, she said that we would take the midterm test next week."
Mia : "That is right. So, we must prepare it well."
Tia : "I agree with you."
okai dan mereka hondation
a. Which one is the expression of checking someone's understanding?
b. What is the relationship of the speakers?​

Mia : “Tia, do you remember what our class teacher said yesterday?”