If f(x)=a x^7+b x^3+c x-5,a , b , c are...

If `f(x)=a x^7+b x^3+c x-5,a , b , c` are real constants, and `f(-7)=7,` then the range of `f(7)+17cosx` is `[-34 ,0]` (b) `[0, 34]` `[-34 ,34]` (d) none of these

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