Consider a monopolist that is able to distinguish between two distinct market segments, A and $B,$ for its product. Marginal cost is constant at $$18$ for each unit produced. The firm is currently selling its output at a single price and allocating its output across segments such that marginal revenue in segment $A$ is $$25$ and marginal revenue in segment $B$ is $$15.$ How can this firm maximize its profit?

$$ decrease the output in segment A and increase the output in segment $B$

increase the output in segment A and decrease the output in segment $B$

decrease the output in segments A and $B$

increase the output in segments A and $B$

maintain the current output and its allocation across segments