Select all the statements correctly describing the relationship between boostrap NAV and NAVBAR.

Both 'nav' and 'navbar' are a general navigation component mostly used for in$-$page navigation elements like tabs or vertical side navigation.

They have different structure. 'nav' contains class structure of $.$nav, $.$nav$-$item, $.$nav$-$link, $.$nav$-$tab, $.$nav$-$pill, while 'navbar' contains class structure of $.$navbar, $.$nav$-$brand, $.$nav$-$nav, $.$nav$-$toggler etc.

'navbar' contains built$-$in classes for responsiveness design, allowing the navigation bar to collapse in a small screen and expand in a wider screen.

Both of them can be used interchangably.