Final answer:
The annual open enrollment period for employer-sponsored group health plans can vary, but there is a standardized open enrollment period for individual health insurance plans under the Affordable Care Act.
Step-by-step explanation:
The annual open enrollment period for employer-sponsored group health plans can vary depending on the specific employer and insurance provider. However, under the Affordable Care Act, there is a standardized open enrollment period for individual health insurance plans. This period typically runs from November 1 to December 15 each year. It is important to note that employer-sponsored group health plans may have different enrollment periods, so it is recommended to consult your employer or insurance provider for specific information.