Which document must employers provide to inform employees of their rights under FMLA?

The correct choice is the FMLA rights poster because it is a specific requirement under the Family and Medical Leave Act (FMLA) for employers to clearly communicate employees' rights regarding family and medical leave. This poster must be displayed in conspicuous locations where employees can easily see it, ensuring that all employees are informed about their entitlements under the law.

The FMLA rights poster includes essential information such as the eligibility criteria for FMLA leave, the process for requesting leave, and the specifics regarding employee and employer responsibilities. This provision is designed to promote awareness and enhance compliance with FMLA regulations, empowering employees to exercise their rights.

The other options do not fulfill the specific requirement of formally notifying employees of their rights under the FMLA. While an employee handbook may cover various employment policies, it is not mandated by law to include FMLA rights. Health guidelines documents and tax compliance statements serve different purposes and are unrelated to FMLA information. Thus, only the FMLA rights poster directly addresses the requirement to inform employees about their rights under the FMLA.