A. Invite the acquired company’s AWS accounts to join the organization. Create an SCP that has full administrative privileges. Attach the SCP to the management account.
B. Invite the acquired company’s AWS accounts to join the organization. Create the OrganizationAccountAccessRole IAM role in the invited accounts. Grant permission to the management account to assume the role.
C. Use AWS Security Hub to collect and group findings across all accounts. Use Security Hub to automatically detect new accounts as the accounts are added to the organization.
D. Use AWS Firewall Manager to collect and group findings across all accounts. Enable all features for the organization. Designate an account in the organization as the delegated administrator account for Firewall Manager.
E. Use Amazon Inspector to collect and group findings across all accounts. Designate an account in the organization as the delegated administrator account for Amazon Inspector.