A family of constant N circles has the centre as:
A. $$X = 1{\text{ and }}Y = 2N$$
B. $$X = - \frac{1}{4}{\text{ and }}Y = 4N$$
C. $$X = - \frac{1}{2}{\text{ and }}Y = \frac{1}{{4N}}$$
D. $$X = - \frac{1}{2}{\text{ and }}Y = \frac{1}{{2N}}$$
Answer: Option D
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