If the graph of $y = ax^3 + bx^2 + cx + d$ is symmetric about the line $x = k$ then
If the graph of $y = ax^3 + bx^2 + cx + d$ is symmetric about the line $x = k$ then
- A
$k=c$
- B
$k = -\frac{c}{b}$
- C
$a + \frac{c}{{2b}} + k = 0$
- D
none of these
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