Which of the following statements about logistic regression is true?

a. Logistic regression estimates the probability of an observation being in the “yes”

class as a linear function of input variables.

b. Logistic regression does not assume a functional relationship between a binary event and the input variables.

c. Logistic regression generates a linear decision boundary to classify observations.

d. If the p-value of an input variable in a logistic regression model exceeds 0.05, then the input variable is unhelpful in classifying observations and should be removed from the model.