Please choose the correct ending to complete the given sentence: Finance and Business: [header] How to determine your primary health insurance as a dependent on both plans [title] Determine whether the rule covers your situation. [step] The " birthday rule " is used to determine which health insurance plan is primary if you are a dependent on both plans, but it only applies to children. [substeps] If you are a minor, you can use the birthday rule to determine your primary health insurance plan.

Ending1: While an adult needs the birthday rule, a minor means you cannot enroll in another plan. That qualifies you as a dependent (which is very rare in the united states). Ending2: The rule also may apply if you are over the age of 18, but you're a college student and still considered a dependent of your parents. [title] Find out the birthdays of your parents. Ending3: For children under 6 months of age, your child's primary insurance is dependent on your primary medical or dental insurance. If you are a minor, you cannot use the birthday rule. Ending4: This applies if you are a minor and do not have any dependents. Children under the age of 13 can then " parent " the plans that their baby cannot buy or the plan that their doctor can buy.

Answer format: ending1/ending2/ending3/ending4