In a binary tree, a full node is a node with two children, a half node is a node with one child, and a leaf node is a node with no children.

Let N $=$ number of nodes, F $=$ number of full nodes, L$=$ number of leaves, and H $=$ number of half nodes.

Question $3$Select one or more:

a$.$

L $-$ F $=1$

b$.$

$2$F $+$ H $=$ N $-1$

c$.$

N $=2$F $+$ H $+$ L

d$.$

N $=2$F $+$ H

e$.$

L $+$ F $=$ H

f$.$

N $=$ F $+$ H $+$ L