npm registry

How many official public NPM registries are there?

	yes	no
one	[x]	[ ]
two	[ ]	[x]
many	[ ]	[x]

An NPM mirror...

	yes	no
is a read-only copy of the main NPM registry	[x]	[ ]
lets you install any module that exists in NPM	[x]	[ ]
lets you publish updates and new packages	[ ]	[x]

There are at least three ways to use a mirror. How do you specify the registry when installing an NPM package?

	yes	no
npm install <package name> --registry http://registry.npmjs.org	[x]	[ ]
npm <package name> --registry http://registry.npmjs.org	[ ]	[x]