A developer created these three Rollup Summary fields in the custom object, Project__c:

The developer is asked to create a new field that shows the ratio between rejected and approved timesheets for a given project.
Which should the developer use to implement the business requirement in order to minimize maintenance overhead?

Developers at Universal Containers (UC) use version control to share their code changes, but they notice that when they deploy their code to different environments they often have failures.
They decide to set up Continuous Integration (CI).
What should the UC development team use to automatically run tests as part of their CI process?

A developer needs to create an audit trail for records that are sent to the recycle bin. Which type of trigger is most appropriate to create?

A developer has a Visualforce page and custom controller to save Account records. The developer wants to display any validation rule violations to the user.
How can the developer make sure that validation rule violations are displayed?

A developer identifies the following triggers on the Expense__c object:

The triggers process before delete, before insert, and before update events respectively.
Which two techniques should the developer implement to ensure trigger best practices are followed?
Choose 2 answers