What is the order in which nodes of this tree are processed in preorder?

  • A: Z, =, Y, *, A, +, X
  • B: =, Z, +, *, X, Y, A
  • C: Y, A, *, X, Z, +, =
  • D: =, Z, +, *, Y, A, X
  • E: Z, Y, A, *, X, +, =

    Answer: D

    In preorder, a node is processed prior to its children.

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