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Chun was asked whether the following equation is an identity:$\newline$$$3(2 x-1)^{2}+27=36 x^{2}-36 x+36$$$\newline$He performed the following steps:$\newline$$$3(2 x-1)^{2}+27$$$\newline$$\stackrel{\text { Step } 1}{\hookrightarrow}=3(2 x-1)(2 x-1)+27$$\newline$$\stackrel{\text { Step } 2}{\hookrightarrow}=(6 x-3)(6 x-3)+27$$\newline$$\stackrel{\text { Step } 3}{\hookrightarrow}=36 x^{2}-18 x-18 x+9+27$$\newline$$\stackrel{\text { Step } 4}{\hookrightarrow}=36 x^{2}-36 x+36$$\newline$For this reason, Chun stated that the equation is a true identity.$\newline$Is Chun correct? If not, in which step did he make a mistake?$\newline$Choose $1$ answer:$\newline$(A) Chun is correct.$\newline$(B) Chun is incorrect. He made a mistake in step $2$.$\newline$(C) Chun is incorrect. He made a mistake in step $3$.$\newline$(D) Chun is incorrect. He made a mistake in step $4$.