Identify the equation to calculate the balance factor, B$,$ of an AVL tree node N$.$

B $=$ m a x $($ H e i g h t $($ R i g h t S u b T r e e $($ N $)),$ H e i g h t $($ L e f t S u b T r e e $($ N $)))$

B $=$ H e i g h t $($ L e f t S u b T r e e $($ N $))+$ H e i g h t $($ R i g h t S u b T r e e $($ N $))$

B $=$ H e i g h t $($ L e f t S u b T r e e $($ N $))$ H e i g h t $($ R i g h t S u b T r e e $($ N $))$

B $=$ m i n $($ H e i g h t $($ R i g h t S u b T r e e $($ N $)),$ H e i g h t $($ L e f t S u b T r e e $($ N $)))$