Which term is an example of a reverse member expansion?

• A. TreeDescendantsR
• B. RTreeDescendants
• C. TreeDescendantsReverse
• D. ReverseTreeDescendants

Answer: (A)

The idea here is that reverse member expansion is commonly signaled by a compact suffix indicating reversal. When describing expanding a member to include its descendants, adding a trailing R to the base term (TreeDescendants) clearly denotes doing that expansion in reverse. So TreeDescendantsR communicates “perform the descendants expansion in reverse,” using a concise, conventional naming pattern.

Options that start with R, or spell out Reverse, tend to read as a different function or a differently named variant and aren’t the standard way to express reverse expansion. That’s why the trailing R form is the best choice.