If a company experiences an increase in rent expense, the total cost line on the cost-volume-profit graph will:

shift upward, and the break-even point will shift downward.

shift upward, and the break-even point will also shift upward.

shift upward and have a steeper slope, and the break-even point will also shift upward.

shift upward and have a flatter slope, and the break-even point will be unchanged.