A company recently deployed a Visualforce page with a custom controller that has a data grid of information about Opportunities in the org.
Users report that they receive a ''Maximum view state size limit'' error message under certain conditions.
According to Visualforce best practice, which three actions should the developer take to reduce the view state? Choose 3 answers

What tool in the Developer Console contains information on SOQL query Cardinality?

A developer is writing a Visualforce page to display a list of all of the checkbox fields found on a custom object.
What is the recommended mechanism the developer should use to accomplish this?

A developer wrote an Apex class to make several callouts to an external system.
If the URLs used in these callouts will change often, which feature should the developer use to minimize changes needed to the Apex class?

Which of the following variables are not transmitted in the view state? (Choose two.)