Graph the parametric curves. Include arrows indicating the direction of motion.
$$(\mathbf{a}) \quad(t, t) , -\infty < t < -\infty $$
$$(b) (\sin t, \sin t) , 0 \leq t \leq 2 \pi$$
$$(\mathrm{c})\left(e^{t}, e^{t}\right) , -\infty < t < -\infty $$
$$(\mathrm{d})\left(t^{3}, t^{3}\right) , -1 \leq t \leq 1 $$