It depend on all such as guess ,observation ,hypothesis and etc
Explanation:
An organizational unit (OU) is a subdivision within an Active Directory (hierarchical collection of network resources that can contain users, computers, printers, and other Active Directories) into which you can place users, groups, computers, and other organizational units. Each domain can implement its own organizational unit hierarchy, typically used either to differentiate between objects with the same name, or to parcel out authority to create and manage objects.
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Answer:
False.
Explanation:
When we declare a variable as reference type we have to initialize that variable otherwise the compiler will give error that the reference variable is not initialized.You also cannot initialize the variable Foo& with NULL value because it is a reference variable and we have to initialize it.
On the other there is no need to initialize the variable Foo * since it is a pointer it can also store NULL value.
So the answer is only Foo* can store NULL value not Foo &.