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Use the given scale factor and the side lengths of the scale drawing to determine the side lengths of the real object.$\newline$Scale factor: $3: 1$$\newline$Scale drawing$\newline$a$\newline$Object$\newline$A. Side $a$ is $7$ inches long and side $b$ is $6$ inches long.$\newline$B. Side $a$ is $63$ inches long and side $b$ is $54$ inches long.$\newline$C. Side $a$ is $18$ inches long and side $b$ is $15$ inches long.$\newline$D. Side $a$ is $24$ inches long and side $b$ is $21$ inches long.