What can we say about the t distribution multiplier used in computing the prediction intervals in the simple linear regression (i.e., linear regression with only two coefficients: the intercept and the slope)? Please select all that apply. It's possible that only one answer is correct.

A. The degree of freedom of the t distribution is (n-1), where n is the sample size

B. The multiplier is a quantile.

C.The multiplier is a probability.

D. When we know 2 (the variance of error), we can use the standard normal distribution to replace the t distribution.