Figure 4.
(A) Type 0, (B) Type 1, (C) Type 2, (D) Type 4, and (E) Type 4.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.