What method can be used to associate an application with job postings in a schema?

The appropriate method to associate an application with job postings in a schema involves creating a master-detail relationship from Applications to Job Postings. This method establishes a strong coupling between the two objects, ensuring that each application is directly related to a specific job posting.

In a master-detail relationship, the master object (in this case, Job Postings) controls certain behaviors of the detail object (Applications). For instance, if a job posting is deleted, all related applications would also be deleted automatically. This relationship is ideal when the detail (Applications) needs to abide by the lifecycle and security of the master (Job Postings).

Additionally, from a reporting perspective, this relationship allows for easier aggregation of data. For example, you can quickly find an overview of all applications related to a specific job posting.

In this context, although a lookup relationship could also be employed (which would allow for more flexibility by not enforcing the strong dependency), it doesn't provide the same level of data integrity or cascading effects that a master-detail relationship offers. Therefore, establishing a master-detail relationship from Applications to Job Postings is the best approach for managing this association.