Answer : Option **A**

Explanation :

Solver is used to find an optimal (maximum or minimum) value for a formula in one cell — called the objective cell — subject to constraints, or limits, on the values of other formula cells on a worksheet. Solver works with a group of cells, called decision variables or simply variable cells that are used in computing the formulas in the **objective and constraint cells**. Versions of Solver prior to Excel 2007 referred to the objective cell as the **"target cell,"** and the decision variable cells as **"changing cells" or "adjustable cells"**.