Explanation:

When a developer enqueues a job using the System.enqueueJob() method for a class that implements the Queueable interface, Salesforce tracks the job status. Here’s how a developer can check it:

C. View the Apex Jobs page
The Apex Jobs page (in Setup under Monitoring) lists all executed asynchronous jobs, including Queueable, Batch, Scheduled, and Future jobs. It shows details like status (Completed, Failed, Queued), completion date, and errors if any.

D. Query the AsyncApexJob object
This object stores metadata about all asynchronous jobs. A developer can use SOQL like:

SELECT Id, Status, JobType, NumberOfErrors FROM AsyncApexJob WHERE JobType = 'Queueable'

This allows fine-grained tracking and even programmatic logic based on job status.