For all \( a, b \in R \) the function \( f(x)=3 x^{4}-4 x^{3}+6 x^{2}+a x+b \) has (a) No extrem...

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For all \( a, b \in R \) the function \( f(x)=3 x^{4}-4 x^{3}+6 x^{2}+a x+b \) has
(a) No extremum
(b) Exactly one extremum
(c) Exactly two extremum (d) Three extremum
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