Salesforce Updated Platform-App-Builder Exam Questions and Answers by kathleen

 Preexisting information will remain even if it was over 255 characters if the app builder tries to convert a preexisting long text area field to text area. However, users will not be able to edit or save records with more than 255 characters in that field until they reduce the number of characters. Preexisting information will not truncate, be lost, or cause an error message.

If an employee attempts to edit the description field after submitting an opportunity for approval, they will be presented with a ‘Record Lock’ notification. This means that the record is locked for editing while it is in the approval process and only users with the “Modify All” permission or users above them in the role hierarchy can edit it. [Source]

To track the total number of trails associated with a park without writing code, the correct actions to take are:

Use a roll-up summary field on the Park record to show the total number of Trails (B). Roll-up summary fields calculate and display a value in a master record based on the values of fields in a detail record. They are used to count, sum, average, or get the minimum/maximum of values in related detail records.

Use a master-detail relationship between the Park and Trail objects (C). Master-detail relationships are necessary for roll-up summary fields as they allow the master object to control certain behaviors of the detail object and summarize data from those detail records.

A formula field (A) cannot dynamically count related records unless those records are linked via a master-detail relationship, and it cannot alone handle counts across related records without such a relationship. A lookup relationship (D) does not support roll-up summaries unless combined with additional tools like triggers or third-party apps, which involve coding or extra configuration outside standard object setup.

For more details, refer to the Salesforce Help documentation on master-detail relationships and roll-up summary fields:

Master-Detail Relationship: https://help.salesforce.com/articleView?id=relationships_considerations.htm &type=5

Roll-Up Summary Fields: https://help.salesforce.com/articleView?id=fields_about_roll_up_summary_fields.htm &type=5

Related record and Tabs. These are correct because the related record component allows service agents to view and edit fields from a related record on the same page, and the tabs component allows service agents to switch between different views of related lists or other components on the same page.