AWS Certified Advanced Networking - Specialty (#15)

Your company uses an NTP server to synchronize time across systems. The company runs multiple versions of Linux and Windows systems. You discover that the NTP server has failed, and you need to add an alternate NTP server to your instances. Where should you apply the NTP server update to propagate information without rebooting your running instances?

DHCP Options Set
instance user-data
cfn-init scripts
instance meta-data