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Pam is installing a new window in her backyard workshop, to let in more natural light. She wants the window to be square, since she thinks that will look best, and she will include a $1.5$-inch-wide window frame on all four sides of the window.$\newline$The total area of the window and frame in square inches can be modeled by the expression $(x + 3)(x + 3)$, where $x$ is the width of the window in inches. This expression can also be written in the form $x^2 + 6x + 9$.$\newline$What does the quantity $6x + 9$ represent in the expression?$\newline$Choices:$\newline$(A)the perimeter around the outside of the frame in inches$\newline$(B)the width of the window and frame together in inches$\newline$(C)the area of the frame in square inches$\newline$(D)the area of the window in square inches$\newline$