Explanation
The consultant can recommend creating a reusable OmniScript to update address information. 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 collects the address information in a consistent way using the same labels and input elements, and then use it in multiple OmniScripts that need to update address information.
This will improve the design and maintenance of the OmniScripts.

Explanation
The two use cases that are best solved using Calculation Procedures & Matrices are: To apply the correct factor when determining a cost and To return output that is calculated differently based on the date. A Calculation Procedure is a tool that can perform complex calculations based on multiple input and output variables. A Calculation Matrix is a tool that can perform complex calculations based on multiple input variables and output values within groups. The consultant can use Calculation Procedures & Matrices to solve these use cases, because they involve applying rules and formulas to different data values and scenarios

Explanation
The OmniStudio data tool that the consultant should recommend in this scenario is an Integration Procedure.
An Integration Procedure can execute multiple DataRaptor actions, such as Extract, Transform, and Load, and also invoke REST or SOAP services. In this case, the Integration Procedure can retrieve data from an external system via a REST API and store it in a JSON object for the OmniScript to display