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Which equation describes this relationship? Remember to include $k$, the constant of variation.$\newline$$a$ varies jointly with $b$ and $c$ and inversely with $d$$\newline$Choices:$\newline$(A) $a = \frac{kbc}{d}$$\newline$(B) $a = \frac{kcd}{b}$$\newline$(C) $a = kbcd$$\newline$(D) $a = \frac{kc}{bd}$