Write the formulas that calculate the total production time for casting, machining, and final assembly. Enter a mathematical formula in the objective cell, and then enter formulas to link the objective cell with the appropriate cells. Which of the following options correctly describes the process for calculating the total production time?

A) Enter a mathematical formula in the objective cell and link it to the appropriate cells.
B) Enter a formula in the objective cell and link it to the appropriate cells.
C) Enter a mathematical formula in the objective cell and link it to the relevant cells.
D) Enter a formula in the objective cell and link it to the relevant cells.