A developer must create a CreditCardPaymentclass that provides an implementation of an existing Paymentclass.

Which is the correct implementation?

What is the preferred way to reference web content such as images, style sheets, JavaScript, and other libraries that is used in Visualforce pages?

A developer needs to confirm that an Account trigger is working correctly without changing the organization's data.What would the developer do to test the Account trigger?

Which two describe Heroku Redis? Choose 2 answers.

A developer wants to use all of the functionality provided by the standard controller for an object, but needs to override the Save standard action in a controller extension. Which two are required in the controller extension class?