Explanation
The three OmniScript elements that should be used to meet the requirements are: DataRaptor Extract Action, Email Action, and Calculation Action. A DataRaptor Extract Action can retrieve data from a Salesforce object, such as total insurance premiums paid and the difference year over year, and store it in an Interface object or a JSON object. An Email Action can send an email to the customer with a summary report attached, using data from an Interface object or a JSON object. A Calculation Action can perform mathematical operations on data from an Interface object or a JSON object, such as calculating the difference year over year

Explanation
The two reasons that explain why Integration Procedures are recommended as the first choice of data sources for FlexCards and OmniScripts are: they future-proof your front-end design and they combine multiple actions into a single server call. An Integration Procedure can abstract the data source from the front-end design, making it easier to change or update the data source without affecting the FlexCard or OmniScript. An Integration Procedure can also execute multiple DataRaptor actions, such as Extract, Transform, and Load, and also invoke REST or SOAP services in one call, reducing the number of requests and processing time