Please help me with this Bayes network questions.

[15 pts] Consider the belief network for a \"Simple diagnostic system given below. Use the network to answer the following questions. (a) (2 points} The posterior probabilities of which variables change when Smokes is observed to be true? That is, give the variables X such that P(X |Smoke : true) 7E P(X). (b) (2 points) Starting from the original network, the posterior probabilities of which variables change when Fever is observed to be true? That is, specify the X where P(X | Fever = true) # P(X).(e) (2 points} Does the probability of Fever change when Wheezing is observed to be true? That is, is P(Fever|Wheezing = true} 7E P[Fever}