If a test of hypothesis has a type I error of 0.01, what does it mean?
a) If the null hypothesis is true, we reject it 1% of the time.
b) If the null hypothesis is true, we don't reject it 1% of the time.
c) If the null hypothesis is false, we don't reject it 1% of the time.
d) If the null hypothesis is false, we reject it 1% of the time.