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Ed is planning to put a square fish pond in the corner of his backyard. He is also planning to add a $5$-foot-wide walkway around two sides of the fish pond, since the backyard fence will go along the other two sides.$\newline$The total area of the fish pond and walkway in square feet can be modeled by the expression $(x + 5)(x + 5)$, where $x$ is the width of the fish pond in feet. This expression can also be written in the form $x^2 + 10x + 25$.$\newline$What does the quantity $10x + 25$ represent in the expression?$\newline$(A)the length of the fish pond and walkway together in feet$\newline$(B)the perimeter around the outside of the fish pond and walkway together in feet$\newline$(C)the area of the fish pond in square feet$\newline$(D)the area of the walkway in square feet