In regions where cultural barriers contribute to delayed vital registration, coupled with limited access to registration facilities, what unfortunate consequence may occur?

d$)$ Increased government spending on awareness campaigns to promote timely registration

b$)$ Inaccurate census data leading to population discrepancies

c$)$ The official recognition of some children's existence may never happen, particularly if they die before their births are registered

a$)$ Overcrowding in registration offices due to delayed registrations