(Choose 1 answer)
When representing any algebraic expression E which uses only binary operations in a 2-tree (every node other than the leaves has two children),
A. the variable in E will appear as external nodes (leaves) and operations in internal nodes
B. the operations in E will appear as external nodes (leaves) and variables in internal nodes
C. the variables and operations in E will appear only in internal nodes
D. the variables and operations in E will appear only in external nodes (leaves)
E31
