Which option ONLY uses pipe characters in its definition?

• A. Substitution variables
• B. XFGetCells
• C. Parameters
• D. Answer

Answer: (A)

Pipe-delimited placeholders define substitution variables. When you see a name wrapped in pipe characters, like |Year| or |Region|, that exact pipe-delimited form is what identifies a substitution variable. It uses only pipe characters to mark the variable, which is why this option is the one that “only uses pipe characters in its definition.”

The other items aren’t defined that way: XFGetCells is a function-like reference and would involve parentheses and arguments, not just pipes; Parameters are defined with a different syntax that doesn’t rely on single-character delimiters; and Answer is just a plain label, not a pipe-delimited placeholder.