Which of the descriptions listed below best describes the step in the reverse engineering process called functional analysis? a) the product's purpose is identified, observations are made to determine how the product works and the system's inputs and outputs are listed b) the product is analyzed based on the choice of materials, mass, durability, strength, transparency, frictional properties, flexibility, and resistance to fatigue c) the product is analyzed based on various principles and elements of design such as texture, color, balance, rhythm, proportion, and unity d) the product is analyzed as it is carefully disassembled in non-destructive operations. all parts should remain intact and undamaged.