What are some of the myths surrounding immigration to Costa Rica?

I - The migration of Nicaraguans to Costa Rica is a recent phenomenon.
II - The impact of Nicaraguan immigration on the Costa Rican economy has been negative.
III - Nicaraguan immigrants make excessive use of health services in Costa Rica.
IV - Nicaraguan immigrants are responsible for a significant portion of violent and criminal acts in Costa Rica.
a) Only I and II are true.
b) Only III and IV are true.
c) Only II and IV are true.
d) Only I and III are true.
e) None of the above.