$2.(1$ mark$)$ cupSize is the name $($or identifier$)$ of a variable in my JavaScript program, and clicking on any of the buttons labeled "Short," "Tall," or "Grande" causes that variable to be loaded with a different value. A JavaScript variable should be declared in a var statement before it is used. Note the line numbers that your editor puts down the left side of the code in its editing window. Which line is the variable cupSize declared on$?($Hint: Look for the "var" keyword in front of the identifier "cupSize."$).$