X1= age in yearsX2= 1 for female and 0 for maleX3= 1 for smoker and 0 for non smoker

Suppose an interaction term x4 is added to the model from question 2, where X4=X2*X3 ("sex times smoking status") The resulting model is: LHS = intercept + BjX1 + B2x2 + B3x3 + BAX4 Where LHS = "left hand side", and intercept =B. or In(2. (t)) . - Which of the following does the interaction term allow for? a. Separate estimates of the age-adjusted relationship between the LHS and smoking status, for males and females. b. Separate estimates of the sex-adjusted relationship between the LHS and smoking status, for different age values. c. A non-linear association between the LHS and age, after adjusting for sex and smoking status. d. This ensures the age and sex adjusted relationship between LHS and smoking is statistically significant