Database design questions

I have these questions and looking for validation, these questions are part of test:

- Foreign keys implement: a) one to one relationship b) m:n relationship c) one to many relationship d) recursive relationship e) a, c and d are true
- Identify the dependency type shown by the attribute PATIENT- BALANCE. CHAGRES (PHYSICIAN #, PATIENT#, PATIENT –NAME, PATIENT-ADDRESS, PATIENT-BALANCE) a) partial, b) full c) transitive d) multivalued e) join
- A logical transaction is a) the collection of all update of a given record b) an update of a single record in the db c) a collection of updates in which all must be accomplished or non must be accomplished d) a collection of updates from various users being made concurrently
- A relationship of degree 4 will produce a table with 4 fields in the primary key (true / false)
- A relationship with many as the maximum cannot have 0 as the minimum (true/ false)
- Mandatory and optional are possibilities for maximum cardinality (true/ false)

thanks