The Client option is available on the Choose an installation option page in Microsoft Dynamics NAV 2013 Setup.
When you choose the Client option, Microsoft Dynamics NAV Setup installs the following component:
Microsoft Dynamics NAV Windows client
Microsoft Office Excel Add-In
The Microsoft Dynamics NAV Windows client constitutes tier one in the Microsoft Dynamics NAV three-tier Product Architecture. Microsoft Dynamics NAV Server is tier two, and SQL Server Database Components, together with SQL Server or SQL Server Express, is tier three.
You can configure the Client option to add or remove components by choosing Customize under the Client option on the Choose an installation option pane. You can configure the Client option to add or remove components on the Customize the installation page.
Additional components available under the Client option include the Microsoft Dynamics NAV Development Environment, and the Microsoft Office Outlook Add-In.