An ellipse with major axis and minor axis as 8 and 2 units respectively, slides along the coordinate axes keeping the contact with axes. Then the locus of its foci is
A. x²+y² +1/x²+1/y²+=16
B. x² + y² + 4/x² 4/y² = 16
C. x²+y²+1/x²+1/y²=64
D. x² + y²+4/x²+4/y²=64