A discrete-time signal $x[n] = \delta[n – 3] + 2 \delta[n – 5]$ has $z$-transform $X(z)$. If $Y(z) = X(-z)$ is the $z$-transform of another signal $y[n]$, then
1. $y[n] = x[n]$
2. $y[n] = x[-n]$
3. $y[n] = -x[n]$
4. $y[n] = -x[-n]$