Company X produces radio equipment. The company is considering the use of high-quality materials to enhance the quality of its products and create a positive reputation in the market. If the company applies the plan, the variable cost per unit would increase. The company will also need to pay additional money into an advertising campaign. Overall, the company expects that contribution margin would increase. However, the company expects that the additional advertising costs would be higher than the increase in contribution margin. What would be the effect of the new plan on operating income? a. Operating income would increase b. Cannot be determined due to limited information c. Operating income would remain the same. d. Operating income would decrease