Of type I and type II error, which is traditionally regarded as more serious?

a.Type I is considered to be more serious.

b.Type II is considered to be more serious.

c.Type I and Type II are equally serious.

d.Neither Type I or Type II is serious and both can be avoided.

A type I error occurs when the:

a.null hypothesis is incorrectly accepted when it is false

b.null hypothesis is incorrectly rejected when it is true

c.sample mean differs from the population mean

d.test procedure itself is fundamentally biased