Which of the following is a function of what-if analysis?
a. Collecting data from web pages on behalf of a user
b. Establishing relationships between many variables and changing some of the variables to see how others are affected between many variables and changing some of the variables to see how others are affected
c. Establishing relationships between different variables by keeping them constant
d. Establishing a target value for a particular metric and telling the program which variable to change to try to reach the goal
