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Seth, a carpenter, is helping a client remodel her backyard patio entryway. The entryway will have a set of double doors that are trimmed with moulding. The double doors will be square, and the moulding will be $2$ inches wide along the top and sides of the door. The total area of the double doors and moulding in square inches can be modeled by the expression $(x + 4)(x + 2)$, where $x$ is the width of the double doors in inches. This expression can also be written in the form $x^2 + 6x + 8$. What does the quantity $6x + 8$ represent in the expression?$\newline$(A)the area of the moulding in square inches$\newline$(B)the height of the double doors and moulding together in inches$\newline$(C)the perimeter around the outside of the double doors and moulding in inches$\newline$(D)the area of the double doors in square inches