Which of the following characteristic features always holds true for the corresponding group of animals
$\begin{array}{cccc}\text{(a)}& \text{Cartilagious endoskeleton}& & \text{Chondrichthyes}\\ \text{(b)}& \text{Vivparous}& & \text{Mammalia}\\ \text{(c)}& \text{Possess a mouth with an upper and a lower jaw}& & \text{Chordata}\\ \text{(d)}& \text{3- chambered heart with one incompletely divided ventricle}& & \text{Reptilia}\end{array}$

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