Step-by-Step Explanation:

Understand the Problem:

Ensure all users in the organization have read-level access to a specific S3 bucket.

The data should not be accessible outside the organization.

Analyze the Requirements:

Grant read access to users within the organization.

Prevent access from outside the organization.

Evaluate the Options:

Option A: Specify "*" as the principal and PrincipalOrgId as a condition.

This grants access to all AWS principals but restricts it to those within the specified organization using the PrincipalOrgId condition.

Option B: Specify all account numbers as the principal.

This is impractical for a large organization and requires constant updates if accounts are added or removed.

Option C: Specify PrincipalOrgId as the principal.

The PrincipalOrgId condition must be used within a policy, not as a principal.

Option D: Specify the organization's management account as the principal.

This grants access only to the management account, not to all users within the organization.

Select the Best Solution:

Option A: Using "*" as the principal with the PrincipalOrgId condition ensures all users within the organization have the required access while preventing external access.

Amazon S3 Bucket Policies

AWS Organizations Policy Examples

Using "*" as the principal with the PrincipalOrgId condition efficiently grants read access to the S3 bucket for all users within the organization.