Final answer:
The HR Case [sn_hr_core_case] table on ServiceNow is an extension of the Case [sn_case] table, which itself is built on the Task [task] table structure.
Step-by-step explanation:
The HR Case [sn_hr_core_case] table in the ServiceNow platform is an extension of the Case [sn_case] table. ServiceNow's table extension architecture allows developers to create modular applications by extending existing tables. The Case table itself is an extension of the Task table, which means that HR Case, as an extension of Case, indirectly extends the Task table as well. By doing so, it inherits fields and behaviors from both the Case and Task tables, enabling a structured approach to managing human resource processes.