单选题 The indegree of () of a tree is always zero.
A. any node
B. a branch
C. the root
D. a leaf
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单选题 If an internal node has 4 outdegree branches, its degree is ().
A. 9
B. 1
C. 4
D. 5
单选题 A node of a tree has a degree of 3. This means its outdegree is ().
A. 0
B. 2
C. 4
D. none of the above
单选题 A () is a sequence of nodes in which each node is adjacent to the next one.
A. leaf
B. root
C. descendant
D. path
单选题 If the height of a tree is 10, the highest level of the tree is ().
A. 10
B. 9
C. 5
D. 1