Universal Containers wants a list button to display aVisualforce page that allows users to edit multiple records.
which Visualforce feature supports this requirement?

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

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?

An Approval Process is defined in the Expense_Item__c. A business rule dictates that whenever a user changes the Status to 'Submitted' on an Expense_Report__c record, all the Expense_Item__c records related to the expense report must enter the approval process individually. Which approach should be used to ensure the business requirement is met?

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

A developer created a Lightning component to display a short text summary for an object and wants to use it with multiple Apex classes.
How should the developer design the Apex classes?