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Mr. Larry, of Larry's Landscaping, is designing a backyard garden for a client. For visual appeal, the client has requested that the length of the garden be equal to twice the width. The client has also asked for the garden to have a rock edging $2$ feet wide around three sides, since the backyard fence will be along the fourth side.$\newline$The total area of the garden and edging in square feet can be modeled by the expression $(2x + 4)(x + 2)$, where $x$ is the width of the garden in feet. This expression can also be written in the form $2x^2 + 8x + 8$.$\newline$What does the quantity $8x + 8$ represent in the expression?$\newline$Choices:$\newline$(A)the length of the garden and edging together in feet$\newline$(B)the area of the edging in square feet$\newline$(C)the area of the garden in square feet$\newline$(D)the perimeter around the outside of the edging in feet