Considering @Page Directives which of the following options suits this line.

"Creates a strongly typed reference to the source page from the target of a cross-page posting."

It provides a way to get the Strong typing aginst the previous page which was accessed through the PreviousPageType property.
It has two attributes

TypeName : This specifies the type name of previous page

Virtual Path : This specifies the path to the file that generates the strong type.