If α₂ = 0.05 for a confidence interval for a mean when σ is known, then which one of the follow is true?
A. zα₂ = 1.645, and CL = 90%
B. zα₂ = 1.960 , and CL = 95%
C. zα₂ = 1.960 , and CL = 90%
D. zα₂ = 1.645 , and CL = 95%