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.
Example of type A classification test results. (A) Correctly identified type A1. (B) Misidentified A3 type as A1 type. (C) Correctly identified type A2. (D) Misidentified A4 type as A2 type. (E) Correctly identified type A3. (F) Misidentified A1 type as A3 type. (G) Correctly identified type A4. (H) Misidentified A3 type as A4 type.
