Final answer:
The HR Chat queue availability is typically decided by the schedule field on the User record, which outlines the availability of the HR personnel to respond to chats.
Step-by-step explanation:
In regards to HR Chat queue availability, the determining factor is usually the schedule field on the User record. This field typically manages the working hours of the HR personnel assigned to the chat, indicating when they are available to respond to inquiries. On the other hand, while HR profiles may contain schedule-related information, this data does not directly control chat availability. Option 4, concerning the schedule field on the Queues record, can indeed hold information about the overall operation schedule of the queue, but the definitive availability of the HR Chat is still reliant on the individual schedules of the users handling the HR Chat. Lastly, HR Chat is not always available; it is subject to the schedules of the HR representatives.