A developer is debugging a JavaScript function that calculates the total price of items in a shopping cart. The function sometimes returns NaN instead of the correct total price. They decide to use GitHub Copilot for assistance. function calculateTotal ( cart ) { let total = 0 ; for ( let item of cart ) { total += item . price * item . quantity ; } return total ; } Which of the following is the best way to use GitHub Copilot to debug and fix this issue?