A rectangular garden has a length that is 3 feet longer than its width. Let w represent the width of the garden, in feet. The entire garden is surrounded by a 2− foot-wide cement walkway. What does the algebraic expression (w+4)(w+7) represent in this context?

A) the area of the garden only
B) the total area of the garden and walkway
C) the perimeter of the garden only
D) the perimeter of the walkway only