Navigate to the threaded discussion and respond to the following prompts: Which of the two estimating techniques (bottom-up or top-down) is more useful for your Integrative Project (that you selected in PROJ-610)? Explain. Which of the two estimating techniques (bottom-up or top-down) is easier to obtain for your Integrative Project (that you selected in PROJ-610)? Explain. What are the potential challenges of getting approval from the top management of the bottom-up estimate, and how do you plan to negotiate with the top management to overcome those challenges