The graph shows the depth of water, in feet, of a horse trough over a certain amount of time, in minutes.

graph with the title Horse Trough with the x axis labeled time in minutes and the y axis labeled depth in feet, with a line segment from 0 comma 0 to 40 comma 6, a line segment from 40 comma 6 to 60 comma 6, a line segment from 60 comma 6 to 100 comma 5, a line segment from 100 comma 5 to 120 comma 5, and another line segment from 120 comma 5 to 180 comma 0

Part A: Identify the interval(s) where the graph is increasing, decreasing, and constant.

Part B: What are the domain and range of the relation?

Part C: Does the graph represent a function? Explain your reasoning.

Part D: Write a detailed description of the graph using the real-world scenario and the information from Part A.