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If $R(\tau)$ is the autocorrelation function of a real, wide-sense stationary random process, then which of the following is $\text{NOT}$ true?

  1. $R(\tau)=R(-\tau)$
  2. $|R(\tau)| \leq R(0)$
  3. $R(\tau)=-R(-\tau)$
  4. The mean square value of the process is $R(0)$
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