Which of the following are true assertions about the variable elimination algorithm, and which are false? 

a. When changing a Bayes net by removing a parent from a variable, the maximum factor size (where size is the number of non-fixed variables involved in the factor) generated during the optimally ordered variable elimination is reduced by at most 1. 

b. The ordering of variables in variable elimination affects the maximum factor size generated by at most a factor of two. 

c. The size of factors generated during variable elimination is upper-bounded by twice the size of the largest conditional probability table in the original Bayes net. 

d. The size of factors generated during variable elimination is the same if we exactly reverse the elimination ordering. 

e. During variable elimination, the ordering of elimination does not affect the final answer.