The Best Way for an Immunodeficient Individual to Prevent Acquiring

The best way for an immunodeficient individual to prevent acquiring Cryptosporidium parvum is to
1) heat water to 40°C for 1 minute.
2) filter water prior to usage.
3) wash vegetables and fruit before eating.

A) 1 and 2
B) 1 and 3
C) 2 and 3
D) 1, 2, and 3