The value of gross domestic product (GDP) differs from the value of gross national product (GNP) when:

Select one:

a.net exports are excluded from GDP but included in GNP.

b.production in one country employs factors of production owned by residents of other countries.

c.production in one country employs only factors of production owned by its residents.

d.when domestic firms that produce in factories abroad are exempt from paying domestic taxes.