Which statement is true about developing in a multi-tenant environment?

A developer has the following code:try {List nameList;Account a;String s = a.Name;nameList.add(s);} catch (ListException le ) {System.debug(' List Exception ');} catch (NullPointerException npe) {System.debug(' NullPointer Exception ');} catch (Exception e) {System.debug(' Generic Exception ');} What message will be logged?

Using the Schema Builder, a developer tries to change the API name of a field that is referenced in an Apex test class.
What is the end result?

For which three items can a trace flag be configured?
Choose 3 answers

What is the result of the debug statements in testMethod3 when you create test data using testSetup in below code?