Please help me with this question. I would really appreciate it. Please explain briefly I am trying to prepare for a test.

Here is the schema for the employee relation: Employee-schema = (SSN, first name, last-name, birth date, address, salary) Now Assume that two people with the same first name and last_name cannot live at the same address, Enumerate all candidate keys for the employee relation and state how many super keys are there for this relation