What would be the advantage of introducing genes into germ cells rather than somatic cells?

What would be the advantage of introducing genes into germ cells rather than somatic cells?
a Genes introduced into germ cells are more readily expressed.
b Genes introduced into germ cells would be passed on to gametes and future generations.
c Introduced genes are more often lost from somatic cells.
d Genes can be more readily inserted into germ cells.
A gene for a bacterial protein with insecticide properties has been introduced into a plant.This plant is now referred to as __________.
A a genetically modified plant
B a transgenic plant
C an insectivorous plant
D both a transgenic plant and a genetically modified plant