Find the critical value and rejection region for a left-tailed $z$-test where $\alpha =0.025$.

Critical value: $z_c=-1.96$

Rejection region: $z_{}>-1.96$

Critical value: $z_c=-1.96$

Rejection region:

Critical value: $z_c=1.96$

Rejection region:

Critical value: $z_c=1.96$

Rejection region: $z>1.96$