A Visual Flow uses an apex Action to provide additional information about multiple Contacts, stored in a custom class, contactInfo. Which is the correct definition of the Apex method that gets additional information?

A developer writes a before insert trigger.How can the developer access the incoming records in the trigger body?

Which SOQL query successfully returns the Accounts grouped by name?

A user selects a value from a multi-select picklist. How is this selected value represented in Apex?

An Opportunity needs to have an amount rolled up from a custom object that is not in a master-detail relationship.
How can this be achieved?