If f(x) =fff\(12-\frac{x^2}{2}\)/fff and f(2k) = 2k, what is one possible value ...【小站备考】

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If f(x) =

$12-\frac{x^2}{2}$ and f(2k) = 2k, what is one possible value for k?

A.2

B.3

C.4

D.6

E.8

我的答案：