You Have Been Asked to Take on the Administration of a Second

You have been asked to take on the administration of a second Jira installation in your company. You were given the following information about user accounts: The company standard is to use Active Directory (AD) to provide user accounts. There are several Active Directory systems in use by different business units. The second Jira is not to be merged with your main Jira. The main Jira system is connected to Active Directory for user accounts. The second Jira is using internal user accounts, not Active Directory. People using the second Jira are using the same login ID as they would use in Active Directory. Your company would like to use Single Sign-on (SSO) but has not yet implemented it for either Jira system. Which authentication method should you recommend?

A) Change the new Jira to use your main Jira's directory services, as that is already reading your Active Directory services.
B) Set up a Crowd server to get the user lists from all internal directories and AD, and use AD directly for the password checking.
C) Set up a Crowd server to pull in all the AD services, and plan to migrate internal users.
D) Change the new Jira to link directly to the required AD servers.