Final answer:
The act of offering flu vaccines to 500 older adult community members in the next 18 months is an example of a process objective, which focuses on the steps necessary to achieve health goals.
Step-by-step explanation:
In the scenario where 500 older adult community members will be offered the flu vaccine in the next 18 months, this strategy represents a process objective. A process objective refers to the implementation activities necessary to achieve desired outcomes in a public health initiative. The action of offering the vaccine to the community members is a step taken to achieve a larger goal of increasing immunity and reducing influenza spread within the population.
On the other hand, an outcome objective would refer to the ultimate result that the health intervention aims to achieve, such as reducing influenza cases or hospitalizations among older adults. An example of passive intervention would be natural changes that occur without direct health promotion activities, which is not the case here. Lastly, the term impact objective describes the long-term effects of the program's activities but is less specific to the direct actions like administering vaccines.