let `f(x)=a_0+a_1x^2+a_2x^4+............a_nx^(2n)` where `0< a_0 < a_1 < a_3 ............< a_n` then `f(x)` has

let `f(x)=a_0+a_1x^2+a_2x^4+............a_nx^(2n)` where `0< a_0 < a_1 < a_3 ............< a_n` then `f(x)` has
by

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let `f(x)=a_0+a_1x^2+a_2x^4+............a_nx^(2n)` where `0< a_0 < a_1 < a_3 ... ... B. only one minimum C. only one maximum D. both maxima and minima
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