* A. Junction object between Applicant and Job:
* Since anApplicantcan apply for multipleJobsand eachJobcan have multipleApplicants, this is a many-to-many relationship.
* Salesforce requires ajunction objectto represent many-to-many relationships. The junction object will have two master-detail relationships: one to the Applicant object and one to the Job object.
* The junction object could be named something like JobApplication__c, which would represent the specific instance of an applicant applying for a particular job.
* Why this is the correct approach?
* A junction object allows for robust data management and reporting capabilities in a many-to- many relationship.
* This design ensures that each combination of applicant and job is captured as a unique record in the JobApplication__c junction object.
* It also allows storing additional details about the application, such as application date, status, and feedback.
Why not the other options?
* B. Lookup field from Applicant to Job:
* A lookup field creates a one-to-many relationship. While an Applicant could reference one Job, it does not support the many-to-many relationship required in this scenario.
* C. Master-detail field from Applicant to Job:
* A master-detail relationship is a one-to-many relationship, which is unsuitable for a many-to- many relationship. Additionally, you cannot have two master-detail fields on a single object to connect Applicant and Job directly.
* D. Formula field on Applicant that references Job:
* A formula field cannot establish relationships between records or represent a many-to-many relationship. It is only for computed fields.
References:
Creating Many-to-Many Relationships with Junction Objects
Master-Detail and Lookup Relationship Details

The code provided processes all Case records in a single transaction. Since it attempts to process over 10,000 records, it exceeds the Salesforce governor limit of 50,000 DML rows per transaction, causing the transaction to fail.
* Governor Limits on DML Rows (C):Salesforce enforces a governor limit of 50,000 rows for DML operations per transaction. In this case, if the SELECT query retrieves over 50,000 records, the Database.update call will hit this limit and throw a System.LimitException.