<image> The sales performance of Brand A and Brand B computers in the first, second, third, and fourth quarters is shown in the image.
(1) How many more computers did Brand A sell in the first quarter compared to the fourth quarter?
(2) Which brand of computers had the highest total sales over the four quarters?
(3) In which quarter did Brand B have the highest sales?
(4) According to the statistical chart, please analyze the sales trend of Brand B computers.