Figure 2.
4 × 4 matrix illustrating four levels of text crossed with four groups of features, with one example feature for each cell of the matrix.
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.