which situation is it required to set up delegation for the Microsoft Dynamics NAV Web client?

In which situation is it required to set up delegation for the Microsoft Dynamics NAV Web
client?

A.
When the Microsoft Dynamics NAV Web client and the Microsoft Dynamics NAV Server
are on separate computers

B.
When the Microsoft Dynamics NAV Web client and SQL Server are on separate
computers

C.
When the browser and the Microsoft Dynamics NAV Web client are on separate
computers

D.
When the browser and the Microsoft Dynamics NAV Server are on separate computers