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Let $x[n] = x[-n]$. Let $X(z)$ be the $z$-transform of $x[n]$. If $0.5 + j 0.25$ is a zero of $X(z)$, which one of the following must also be a zero of $x(z)$

  1. $0.5 – j 0.25$
  2. $1/(0.5 + j 0.25)$
  3. $1/(0.5 – j 0.25)$
  4. $2+j 4$
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