Let D$0,$ D$1,$ D$2,$ D$3$ be the degree sequence of a tree with n$>=2$ vertices $($assume Dk $=0$ for k$>=4)$

Which of the following must necessarily hold:

Select all that apply

D$3>=$ D$2$

D$2>=$ D$3$

D$1=2+$ D$3$

D$1>=2$

D$0=0$

D$1$ is even