Which of the following are true regarding OSPF areas?1. You must have separate loopback interfaces configured in each area.2. The numbers you can assign an area go up to 65,535.3. The backbone area is also called area 0.4. If your design is hierarchical, then you don't need multiple areas.5. All areas must connect to area 0.

• A. 1 only
• B. 3 and 4 only
• C. 3, 4 and 5
• D. 1 and 2 only

Answer: (C)