The equation of NAND gate is \\\\(Y=\\bar{A}.\\bar{B}\\\\)When both the terminals are connected together.\\\\(A=B=A\\\\)\\\\(Y=\\bar{A}.\\bar{A} =\\bar{A}. \\bar{A}=\\bar{A}\\\\)Which is nothing but the equation of NOT gate.\\\\(Y=\\bar{A}\\\\)Option \\\\(\ extbf A\\\\) is the correct answer