If x^(2)/(f(4a))+y^(2)/(f(a^(2)-5)) repr...

If `x^(2)/(f(4a))+y^(2)/(f(a^(2)-5))` represents an ellipse with major axis as Y-axis and f is a decreasing function,then

(1,4)

(-1,1)

(-1,5)

`(5,oo))`

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