Let Q = quantity produced, P = selling price per unit, VC = variable cost per unit, and TFC = total fixed cost. Which of the following equations is correct?

a. Profit = Q × (P – VC) + TFC
b. Profit = Q × (P – VC) - TFC
c. Profit = Q × (P – VC – TFC)
d. Profit = Q × (P – VC + TFC)