Question 3 1 pts Which of the following is correct when you run MCMC? Select all that apply. (Note that you will get partial credits for each correct answer. But you will also lose points for each incorrect answer.) O Calculate Gelman-Rubin statistic to make sure the chains are all having small fluctuations in a parameter within the chain, and fluctuations across the chains are large O Discard the samples from burn-in phase Run several chains with different initial conditions O Calculate the correlation length and thin the chains