Final answer:
An auditor typically seeks written client representations from management members who are directly responsible for financial reporting, typically the CFO and CEO. The vice president of operations usually does not sign these representations as their role is not primarily involved in the financial reporting process.
Step-by-step explanation:
An auditor must obtain written client representations which are typically signed by members of management who have relevant knowledge and responsibility over the financial information. These individuals generally include the chief financial officer (CFO) and chief executive officer (CEO). In the context of the question, all listed positions (treasurer, CFO, CEO) except for the vice president of operations would normally sign written client representations. The vice president of operations, while holding a high-ranking position, may not be directly involved in the financial reporting process, which is the primary concern for auditors seeking written client representations.