Variable and Conditions - Button to Normal State

My Storyline course is for training on three products, each has a path through the course ending with a knowledge check slide.  The Knowledge check has a button to access questions, when clicked, updates true/false variable to true for that product and user jumps to lightbox questions.  

My goal is to have a Final Quiz button display (hidden to normal state) when all three products variables are changed to true.  The Final Quiz displays only on the product that is the last presented in the course.

What set of variables and conditions are used to have the Final Quiz button display if all three product knowledge questions are complete?

 

Thanks much

 

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