What are two considerations for deciding to use a roll-up summary field? Choose 2 answer's partner.

A developer has a Visualforce 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 executes the following code in the Developer Console:
List<Account> fList = new List <Account> ();For(integer i= 1; I <= 200; i++){fList.add(new Account ( Name = 'Universal Account ' + i));}Insert fList;List <Account> sList = new List<Account>();For (integer I = 201; I <=
20000; i ++){sList.add(new Account (Name = 'Universal Account ' + i));}Insert sList;How many accounts are created in the Salesforce organization ?

What should a developer use to implement an automate approval process submission for case?

A developer wants multiple test classes to use the same set of test dat a. How should the developer create the test data?