Use the graph off to determine each of the following. Where applicable, use interval notation (a) the domain of f (b) the range of f (c) the number at which f has a relative minimum (d) the relative minimum of f 41-26 6810 (a) What is the domain of f? (Use interval notation.) (b) What is the range of f? (Use interval notation.) (c) What is the number at which f has a relative minimum? (d) What is the relative minimum of f?