A. Use Account Team to share records with relevant people.

C. Use Chatter to share records with relevant people.

Explanation:
Option A, using the Account Team, is a suitable solution to enable relevant team members from other departments to access and collaborate on account records. By utilizing the Account Team, you can add people from different departments to the account team and grant them access to the relevant records.

Option C, using Chatter, is also a valid solution. Chatter is an internal collaboration tool in Salesforce that allows for information sharing, collaboration on records, and the creation of discussion groups. By using Chatter, relevant team members from other departments can be added to discussion groups or mentioned in posts related to the relevant records, thereby enabling collaboration and access to the data.

Option B, using the Opportunity Team to share records with relevant people, is not the ideal solution based on the presented scenario. While the Opportunity Team can be useful for sharing opportunity records with relevant members, the question focuses on enabling collaboration and access to account records by members from other departments, not necessarily opportunity records.

Option D, using manual sharing on the account to share specific records, is not the most efficient solution in the given scenario. Manual sharing can be useful in certain situations, but if collaboration is required with members from different departments, using the Account Team or Chatter is more recommended to ensure effective collaboration and access to relevant data....

I did think it was A&D. However noticed that question mentions relevant data and OWD in general. Hence A,B would be correct.

Should be A and D, we are talking about account sharing