Let $D_n,D_1,D_2,D_3$ be the degree sequence of a tree with n $22$ vertices $($assume $D_k=0$ for $k4)$

Which of the following must necessarily hold:

Select all that apply

$D_1$ is even

$D_2{D}_3$

$D_3{D}_2$

$D_{1}2$

$D_1=2+D_3$

$D_v=0$