In an ordered rooted tree, vertex v has address 3.4.5.2.4. Using the universal address system, what is the level of v?

Here are the answers to question 4, based on the address of vertex $v$ being 3.4.5.2.4 in an ordered rooted tree. The universal address system typically defines the address $a_1.a_2.\dots.a_k$ such that $k$ is the depth of the node (number of edges from the root), and $a_i$ is the index of the node among its siblings at that level.

a) At what level is $v$?
The address 3.4.5.2.4 has 5 components. In this addressing system, the number of components indicates the depth of the vertex from the root. If the root is considered at level