Explanation
A: Create criteria-based opportunity sharing rules for each product line. This allows you to specify criteria for sharing an Opportunity with a specific user or group of users. For example, you could create a rule that shares an Opportunity with the product engineer when the Opportunity has a certain product line assigned to it. B.
Enable Default Opportunity Teams for the Opportunity. This allows you to set a default Opportunity Team for an Opportunity, which will automatically assign the product engineer to the Opportunity when it is created.
This is useful when you need to assign a specific user to multiple Opportunities.

Explanation
Shadowing, interviewing, and leading workshops are three approaches that a consultant can use to learn about and empathize with the customer. Shadowing involves observing how the customer performs their tasks and interacts with their systems. Interviewing involves asking open-ended questions to understand the customer's goals, challenges, and pain points. Leading workshops involves facilitating group discussions and activities to elicit requirements, feedback, and solutions from the customer. Verified References:
https://developer.salesforce.com/resources2/certification-site/files/SGCertifiedSalesCloudConsultant.pdf (page 18)
https://trailhead.salesforce.com/en/content/learn/modules/consulting_skills_for_salesforce_professionals/d