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Mabel was asked whether the following equation is an identity:$\newline$$$(4 x-3)(x-2)^{2}=4 x^{3}-19 x^{2}+4 x-12$$$\newline$She performed the following steps:$\newline$$$(4 x-3)(x-2)^{2}$$$\newline$$\stackrel{\text { Step } 1}{\hookrightarrow}=(4 x-3)(x-2)(x-2)$$\newline$$\stackrel{\text { Step } 2}{\hookrightarrow}=(4 x-3)\left(x^{2}-2 x-2 x+4\right)$$\newline$$\stackrel{\text { Step } 3}{\hookrightarrow}=(4 x-3)\left(x^{2}-4 x+4\right)$$\newline$$\stackrel{\text { Step } 4}{\hookrightarrow}=4 x^{3}-16 x^{2}+16 x-3 x^{2}-12 x-12$$\newline$$\stackrel{\text { Step } 5}{\hookrightarrow}=4 x^{3}-19 x^{2}+4 x-12$$\newline$For this reason, Mabel stated that the equation is a true identity.$\newline$Is Mabel correct? If not, in which step did she make a mistake?$\newline$Choose $1$ answer:$\newline$(A) Mabel is correct.$\newline$(B) Mabel is incorrect. She made a mistake in step $2$.$\newline$(C) Mabel is incorrect. She made a mistake in step $3$.$\newline$(D) Mabel is incorrect. She made a mistake in step $4$.