Which of the following statement is not ture about a random effect model with one factor?

A、The variance of the random error is equal to that of processing effect;

B、The effects of different treatment levels all follow a normal distribution, the mean is 0, and the variance is the same.;

C、The mean of the random error is 0;

D、The variance of any observation is the sum of the variance of the random error and the variance of the treatment effect