The estimated future market values and M&O costs for the following defender and challenger are shown below. We are interested only in what happens over the next three years.If the defender is to be replaced, it must be done now or kept in-place for the 3 years. If i=10%/ year and 3 -year study period, determine whether or not the challenger is economically advantageous now. Replace the defender Keep the defender Replace the defender after two Replace the defender after three years