Load a package pkg, with the package options given in the comma-separated list options, as here.
\usepackage[options]{pkg}.
To specify more than one package you can separate them with a comma,
as in \usepackage{pkg1,pkg2,...}, or use multiple
\usepackage commands.
Any options given in the \documentclass command that are unknown
to the selected document class are passed on to the packages loaded with
\usepackage.