Which of the following refers to a formal amendment to an employment agreement?

The correct choice is the term that specifically indicates a formal change to an existing employment agreement. In legal contexts, a "contract variation" refers to any alteration or modification of the terms of an existing contract. This could include changes to salary, benefits, job responsibilities, or any other aspect of the employment agreement that both parties agree upon.

A "termination clause" pertains to the conditions under which an employment relationship may be ended, rather than an amendment to the agreement itself. "Employment verification" involves confirming the details of employment for purposes such as background checks or loan applications, and does not relate to modifying the agreement. Lastly, a "job description update" might involve changes to the roles or responsibilities outlined in an employment agreement, but it does not constitute a formal amendment unless it is documented within the context of the contract variation process.

Thus, the most accurate term for a formal amendment to an employment agreement is "contract variation," as it encapsulates the idea of mutually agreed-upon changes documented and accepted by both parties involved in the employment agreement.