Select the correct statement.

• a.)
• The critical z-score for a two-sided test at a 20% significance level is 0.85.
• b.)
• The critical z-score for a left-tailed test at a 12% significance level is -0.45.
• c.)
• The critical z-score for a right-tailed test at a 9% significance level is 1.34.
• d.)
• The critical z-score for a two-sided test at a 4% significance level is 1.75.