For the three-part question that follows, provide your answer to each part in the given workspace. Identify each part with a coordinating response. Be sure to clearly label each part of your response as Part A, Part B, and Part C. Part A: Explain what the roots of a function are and how to find them. Part B: Calculate the zeros of the function y=-x²-4x+21. Part C: Describe the graph of the function from Part B, including key characteristics of the function.