A dc power supply has no load voltage of 30 V and full load voltage of 25 V at full load current of 1 A. The output resistance and voltage regulation respectively are

• A. 5 Ω and 25%
• B. 25 Ω and 20%
• C. 5 Ω and 16.7%
• D. 25 Ω and 16.7%