Which of the following objects cannot have a queue?

In Salesforce, queues are used to prioritize and manage the workload for certain types of records by allowing groups of users to manage them collectively. Queues are particularly useful for objects where records can be assigned to multiple users or teams for handling.

Leads and Cases are standard objects that can have queues, making it easy for teams to work collaboratively on these records. Custom objects, provided they are set up correctly with the proper configurations, can also utilize queues to facilitate teamwork among users.

Accounts, however, do not support queues. This object is inherently designed for individual ownership rather than collective management. Each Account record is owned by a single user rather than a group, which is why it cannot be placed into a queue. Consequently, this makes Accounts the correct answer here. Understanding the distinct characteristics of Salesforce objects and their capabilities regarding queues is critical for effective resource allocation and team collaboration.