read the following paragraphs and identify the types of authorities referred to as legislation, regulation, or judicial opinion and indicate whether the authority is primary or secondary:

In a certain town, a number of homeowners have private swimming pools in their back yards. The local City Council passed an:

1) Ordinance requiring homeowners to fence in private swimming pools and

An administrative agency passed a:

2) Regulation requiring certain drains in all swimming pools.

A lawsuit arose after a child drowned in a private swimming pool, and the dispute was resolved in a:

3) Judicial Opinion holding the homeowner complied with applicable laws and regulations related to fencing around the swimming pool, finding no fault on the part of the homeowner.

Later, a law professor studied this area of law and wrote a:

4) Law Review Article explaining the above-referenced judicial opinion related to homeowner liability for operation of private swimming pools.

Identify each of the above as primary or secondary authority and explain your reasoning.