(2) Let c be a real number in the domain D of a function f. When is the value f (c) an absolute minimum on D? Explain with an example. (3) Let c be a real number in the domain D of a function f. When is the value f(c) a local maximum on D? Explain with an example where f (c) is a local maximum but not an absolute maximum. (4) Let c be a real number in the domain D of a function f. When is the value f(c) a local minimum on D? Explain with an example where f (c) is a local minimum but not an absolute minimum