A Customer Recently Provisioned a New Server on the IaaS

Multiple Choice

A customer recently provisioned a new server on the IaaS. The IP address assigned from the pool resolves to another hostname. Some user traffic is being dumped or is causing slowness because of this issue. Which of the following maintenance activities does the provider need to perform to prevent this issue?

A) Use cloud provider tools to remove orphaned resources.
B) Initiate resource reclamation.
C) Run a script to remove stale DNS entries.
D) Update outdated security firewall configurations.