Q 6 The following accompanying table shows the relationship between the speed of a computer's CPU and its benefits and costs. Assume that all other features of the computer are the same (that is, CPU speed is the only source of variation), and only the CPU speeds listed below are available for purchase. CPU GHZ Total Marginal Total Marginal Benefit Benefit Cost Costs 2.0 $1, 000 $900 2.5 $1 , 400 $100 3.0 $300 $1, 200 3.5 $1, 900 $1 , 500 4.0 $2, 000 $400 Application of the Cost-Benefit Principle would lead one to purchase a computer. Select one: O a. 2.0GHz O b. 2.5GHz O c. 3.0GHz O d. 4.0GHz