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 `a in`

`(1,4)`

`(-1,1)`

`(-1,5)`

`(5,oo)`

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