A dc power supply has no-load voltage of 30v,and a full-load voltage of 25v at full-load current of 1A.Its output resistance & load regulation ,respectively are_____________?

A. 25 ? & 20 %

B. 5 ? & 20 %

C. 25 ? & 16.7 %

D. 5 ? & 16.7 %

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