Quartic Function with Absolute Minima

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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 $f(x)$ ?

$x^4-8*x^2+6$

$x^4-7*x^2+5$

$x^4-8*x^2+5$

$x^4-8*x^2+4$

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