What Is Meant by the "Blooming and Pruning" Analogy of Brain

What is meant by the "blooming and pruning" analogy of brain development?

A) The brain produces many more dendrite and synapse connections than it uses (blooming) . Unused connections disappear or are replaced (pruning) .
B) Early brain function is not specialized by location (blooming) . Lateralization (pruning) occurs around 2 years of age.
C) Myelination produces the brain's bumpy surface (blooming) . Brain activity and learning smoothes this surface (pruning) .
D) Areas of the brain mature gradually and uniformly during the first half of life (blooming) and decline in the same manner during the second half of life (pruning) .