Explanation
The three OmniStudio features and tools that the consultant should recommend to meet these requirements are:
OmniScript, Custom Styles, and Newport Design System. An OmniScript is a tool that can design customer interactions using elements and actions. The consultant can use OmniScripts to create the guided processes for the public website. A Custom Style is a feature that allows applying custom CSS properties to an OmniScript or a FlexCard element. The consultant can use Custom Styles to style the OmniScripts using the corporate branding kit, such as colors, fonts, and icons. A Newport Design System is a tool that provides a set of predefined styles and components for building user interfaces. The consultant can use Newport Design System to style the user interface elements in the OmniScripts, such as radio buttons, slide bars, etc., according to the website's style guide

Explanation
The solution that the consultant should recommend to efficiently meet these requirements is to create an OmniScript that uses the reusable property to update contact data and embed it in other OmniScripts. A reusable OmniScript is an OmniScript that can be embedded in another OmniScript as a sub-process. This way, the consultant can create one OmniScript that updates contact data in a consistent way, and then use it in multiple OmniScripts that need to update contact data at different points in the process. This will improve the design and maintenance of the OmniScripts

Explanation
The three OmniScript elements that the consultant should recommend to meet these requirements are:
DataRaptor Post Action, Multi-select Input, and HTTP Action. A DataRaptor Post Action is an action that can write data to a Salesforce object or invoke a Salesforce API. The consultant can use a DataRaptor Post Action to save the data back to Salesforce as a lead. A Multi-select Input is an element that can display a list of options for the user to choose from, such as energy products. A Multi-select Input allows multiple options to be selected at once, and can also have icons for each option. An HTTP Action is an element that can invoke a REST or SOAP service to retrieve data from an external system, such as current energy usage data. An HTTP Action can store the response data in a JSON object for further processing