A complete binary tree of N elements uses array positions 1 to N. Suppose we try to use an array representation of a binary tree that is not complete. Determine how large the array (in terms of N) must be?

A. A binary tree that has two extra levels (that is, it is slightly unbalanced).

B. A binary tree that has a deepest node at depth 2 log N.

C. A binary tree that has a deepest node at depth 4.1 log N.

D. The worst-case binary tree.

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