What would be the abbreviation for "Request for Investigation"?

The abbreviation for "Request for Investigation" is RFI. This abbreviation simplifies communication and maintains clarity, especially in administrative and legal contexts where such terms are frequently used. By using RFI, professionals can quickly convey the specific action or document being discussed without needing to state the full phrase, which can be particularly useful in environments where paperwork and documentation are numerous.

The other options do not accurately reflect the original phrase. RFA typically stands for "Request for Approval," ROC could refer to "Record of Consideration," and REV usually means "Revision" or "Review." None of these properly captures the intent of "Request for Investigation," thus confirming that RFI is the appropriate abbreviation for this term.