Which of the following statements are true regarding parasitological analysis?

I - Samples that cannot be processed immediately should be kept at room temperature, refrigerated, or placed in an oven at 37°C.

II - There are no restrictions on the use of substances such as laxatives, antacids, mineral oils, and barium-containing contrasts before collecting the stool sample.

III - Collecting at least three samples on alternate days increases the possibility of finding parasitic forms, especially Schistosoma eggs, which are irregularly released.

IV - Stool samples can be used to indicate the presence of parasites as well as the presence of fat, mucus, and blood.