c) An experimenter has conducted an experiment to optimize her process and the details and results is as below: Natural Variable Coded Variable Level Factor A Factor B Factor C XI High 20 0 10.0 25 Middle 175 7.5 20 0 Low 150 5.0 15 Run Response, y 535 580 596 563 645 458 350 090- -46090--LL 600 595 648 532 980--LL 656 653 599 620 (i). Identify the design in this experiment. (ii). Upon analyzing, the experimenter obtained the following results (in coded form): y = 624.00 + 9.37x1 + 27.62x2 - 26x3 - 75x1+ 19.5x23 - 35.75x3]- 19.5x142 + 109.25x1x3 + 17.75x2x3 Find the location of the stationary point and calculate the predicted response at the stationary point. What type of surface has been found at the stationary point