You've conducted an experiment to test the impact of changing the layout of an e-commerce app, with the objective of simplifying the user experience. Variant 1 has resulted in an increase of revenues, decrease in click through rate, and decrease in costs. Variant 2 has resulted in flat revenues, increased engagement, and flat cost. What is the correct decision with regard to which variant you should deploy? Select the best answer. a. Variant 1 b. Variant 2 c. Neither d. Further testing of each variant is required