Universal Containers stores Orders and Line Items in Salesforce. For security reason, financial representatives are allowed to see information on the Order such as order amount, but they are not allowed to see the Line items on the Order. Which type of relationship should be used?

Universal Containers has an order system that uses an Order Number to identify an order for customers and service agents. Order will be imported into Salesforce.

A developer is creating an enhancement to an application that will allow people to be related to their employer.
Which data model provides the simplest solution to meet the requirements?

What is a valid source and destination pair that can send or receive change sets? (Choose 2)

An after trigger on the Account object performs a DML update operation on all of the child Opportunities of an Account. There are no active triggers on the Opportunity object, yet a "maximum trigger depth exceeded" error occurs in certain situations.
Which two reasons possibly explain the Account trigger firing recursively? (Choose two.)