What are the two types of Repository Variables?

What are the two types of Repository Variables?

A.
System

B.
Non System

C.
Static

D.
Dynamic

Explanation:
There are static and dynamic repository variables.
Note:
Variables in the Oracle BI Server can be either repository or session variables, and are defined
using the Variable Manager within the Oracle BI Administrator (Manage > Variables).

This brings up the Variable Manager, that divides variables out into repository and session
variables, with a further subdivision into static and dynamic repository ones and system and nonsystem session ones. You can also define variables at the Presentation Server level, these are scoped to individual dashboards and are used amongst other things for setting dashboard prompt values and integrating the dashboard with BI Publisher parameters. Heres a screenshot of a typical Variable Manager screen.