Final answer:
Mandatory coverage for all group health care service contracts typically includes short-term disability and dental care, but does not include treatment for alcoholism or custodial care.
Step-by-step explanation:
The MANDATORY coverage for all group health care service contracts includes several components. Among these options, the ones that are generally covered include short-term disability and dental care. However, treatment for alcoholism and custodial care are not typically included in the mandatory coverage.