What is the recommended treatment for giardiasis?

Metronidazole administration for 8-10 days is recommended.
The use of anti-diarrheal agents is recommended to decrease clinical symptoms.
The use of anti-diarrheal agents is not recommended due to the risk of intestinal damage and bacterial translocation.
a) Only I is correct.
b) Only II is correct.
c) Only III is correct.
d) I and II are correct.
e) I and III are correct.