Quartic Function with Absolute Minima
Let $$f$$ be an even quartic function defined by $$f(x) = ax^4 + bx^2 + c$$. If $$f(0) = 5$$ and $$f$$ has absolute minima at $$x = \pm 2$$, which of the following defines $$f(x)$$?
A
$$x^4-8*x^2+6$$
B
$$x^4-7*x^2+5$$
C
$$x^4-8*x^2+5$$
D
$$x^4-8*x^2+4$$
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