Using this table, determine whether it is more cost-effective to go to Coimbra first or to go to Viseu first, and how much cheaper doing so is than the alternative. a. Going to Viseu first is €57 cheaper than going to Coimbra first. b. Going to Viseu first is €17 cheaper than going to Coimbra first. c. Going to Coimbra first is €57 cheaper than going to Viseu first. d. Going to Coimbra first is €17 cheaper than going to Viseu first.