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Statement $-1: \text{NAND}$ and $\text{NOR}$ gates are called digital building blocks.
Statement$-2:$ The repeated use of $\text{NAND} ($or $\text{NOR})$ gates can produce all the basis or complicated gates.

• A
  Statement $-1$ is false, Statement $-2$ is true.
• ✓
  Statement $1-$is true, Statement $-2$ is true and Statement $-2$ is correct explanation of Statement$-1.$
• C
  Statement $1-$is true, Statement $-2$ is true and statement $-2$ is not correct explanation of statement$-1.$
• D
  Statement $1-$is true, Statement $-2$ is false.