Final answer:
Process serving agencies must keep a statement for each employee on file for a period that can vary by jurisdiction, but common timeframes for record retention are defined in the options provided.
Step-by-step explanation:
The length of time that process serving agencies must keep a statement for each employee on file can vary depending on the jurisdiction and specific laws that apply to process servers in that area. However, one typical requirement might be for the agency to maintain these records for a set number of years, to ensure compliance with legal standards and for audit purposes.
Without more specific information about the jurisdiction in question, it is difficult to provide a definitive answer. However, the options provided suggest common time frames for record retention in many legal and business contexts.