For a complex number $Z = a + ib$,let $\hat{Z} = b + ia$. If $Z_1$ and $Z_2$ are such complex numbers,then $\widehat{Z_1 Z_2} = $

  • A
    $\hat{Z}_1 \hat{Z}_2$
  • B
    $\hat{Z}_1 \hat{\bar{Z}}_2$
  • C
    $\frac{\hat{Z}_1 \hat{Z}_2}{i}$
  • D
    $\hat{Z}_1 Z_2$

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