The profit P(x) (in thousand dollars) that a company earns from the sale of 'x' thousand units is given by P(x) = 3x -x? The sales level x' is in turn a function g(M) of the number of dollars spent on advertising, where 100 8 (M) =21- M+ 100 Express the profit as a function of dollars spent on advertising. none of the options 2M (M+ 300) P(g (M)) = (M+ 100) 2 6M P(g (M)) = (M+ 100) 2 2M2 P(g (M)) = (M+ 100) 2