Do Most Parasitic Plants Completely Over-Grow or Over-Harvest the Host

Do most parasitic plants completely over-grow or over-harvest the host plant?

A) Yes,then the parasitic plant produces seeds and ends its life cycle.
B) Yes,then the parasitic plant produces tendrils which locate and feed from a new host.
C) No,the parasitic plant receives fewer nutrients as the host plant is weakened and none when the host plant is dead.
D) No,most host plants produce a toxin preventing the parasitic plant from reaching full growth.