Which two conditions cause workflow rules to fire? Choose 2 answers

Given the code below:

What should a developer do to correct the code so that there is no chance of hitting a governor limit?

Which salesforce org has a complete duplicate copy of the production org including data and configuration?

A developer is tasked with performing a complex validation using Apex as part of advanced business logic. certain criteria are met for a PurchaseOrder, the developer must throw a custom exception.
What is the correct way for the developer to declare a class that can be used as an exception?

Which two statements are true about using the @testSetup annotation in an Apex test class?
Choose 2 answers