What is the difference between top$-$down and bottom$-$up parser?

Question $2$ options:

A$.$ Bottom$-$up parser tree is built from the root downward to the leaves and top$-$down parse tree is built from the leaves upward to the root.

B$.$ Top$-$down parser builds tree from the root downward to the leaves and

bottom$-$up parser builds tree from the leaves upward to the root.

C$.$ Both of them are built from root downward to leaves

D$.$ Both of them are built from leaves to the root