When Generating a Single Regression Tree Visually, the Prp Function

Multiple Choice

When generating a single regression tree visually, the prp function is used. Based on the following example code, what does setting type = 1 mean?
>prp(default_tree, type = 1, extra = 1, under = TRUE)

A) type = 1 argument is the number of observations that fall into each node displayed.
B) type = 1 argument places the number of cases under each decision node in the diagram.
C) type = 1 argument allows for all nodes, except leaf nodes, to be labeled in the diagram.
D) type = 1 argument allows for the predicting variable to be displayed in root node.