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The following equations represent progressive transverse waves $ Z_1=A \cos (\omega t-k x), Z_2=A \cos (\omega t+k x) \text {, } Z_3=A \cos (\omega t+k y)$ and $Z_4=A \cos (2 \omega t-2 k y)$. A stationary wave will be formed by superposing

• ✓
  $Z_1$ and $Z_2$
• B
  $Z_1$ and $Z_4$
• C
  $Z_2$ and $Z_3$
• D
  $Z_3$ and $Z_4$