What actions types should be configured to display a custom success message?

A developer has the following class and trigger code public class insurancerates{ public static final decimal smokercharge = 0.01; } trigger contacttrigger on contact (before insert){ insurancerates rates = new insurancerates(); decimal basecost=xxx; } Which code segment should a developer insert at the xxx to set the basecost variable to the value of the class variable smokercharge?

A developer wants to handle the click event for a lightning:button component. The on click attribute for the component references a JavaScript function in which resource in the component bundle?

Universal Containers recently transitioned from Classic to Lightning Experience. One of its business processes requires certain values from the Opportunity object to be sent via an HTTP REST callout to its external order management system based on a user-initiated action on the Opportunity detail page. Example values are as follows:
* Name
* Amount
* Account
Which two methods should the developer implement to fulfill the business requirement? (Choose two.)

A Next Best Action strategy uses an Enchance Element that invokes an Apex method to determine a discount level for a Contact, based on a number of factors. What is the correct definition of the Apex method?