For the options shown below, the values of n that you should use to make a correct comparison by the present worth method are: Option A Option B Capital cost, $ -41,000 -63,000 Annual cost, $/year -16,000 -7,000 Salvage value, $ 8,000 15,000 Life, year 4 6 Select one: a. n = 4 for A and n = 4 for B b. n = 4 for A and n = 6 for B c. n = 6 for A and n = 6 for B d. n = 12 for A and n = 12 for B