A developer is implementing an Apex class for a financial system. Within the class, the variables 'creditAmount' and 'debtAmount' should not be able to change once a value is assigned. In which two ways can the developer declare the variables to ensure their value can only be assigned one time? Choose 2 answers

Opportunity opp=[SELECT Id,StageName FROM Opportunity LIMIT 1]; Given the code above,how can a developer get the label for the StageName field?

What are three considerations when using the @InvocableMethod annotation in Apex?
Choose 3 answers

How can a developer retrieve all Opportunity record type labels to populate a list collection?Choose 2 answers

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