You have a single Active Directory directory service domain. You have three Active Directorysites. Site replication is scheduled to occur during business hours only. You plan to make a schema change after business hours. You need to ensure that replication occurs for all sites during the schema change.   What should you do？（）

• A、 Set the Ignore schedules setting for the IP transport.
• B、 Clear the Ignore schedules setting for the IP transport.
• C、 Enable the KCC for all site objects.
• D、 Disable the KCC for all site objects.