The output of the NAND gate will be $\overline{\mathrm{A} \cdot \mathrm{B}}$.
The output of the NOR gate will be
$\overline{\overline{\bar{A} \cdot \mathrm{~B}}+\overline{\overline{\mathrm{A} \cdot \mathrm{~B}}}}=\mathrm{A} \cdot \mathrm{~B}$ The output of the NOT gate will be $\overline{\mathrm{A} \cdot \mathrm{B}}$ Thus, the given network is equivalent to a NAND gate.