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20 Which of the following statements is correct ().
A．There are at most two subtrees in a binary tree, and there are left and right subtrees
B．A binary tree is an ordered tree of degree 2
C．There is no left-right distinction when the node has only one child in a binary tree.
D．There must be a node of degree 2 in the binary tree
B．A binary tree is an ordered tree of degree 2
C．There is no left-right distinction when the node has only one child in a binary tree.
D．There must be a node of degree 2 in the binary tree
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