You don't have to restart the call manager service. Actually according to this guide (read at the bottom) you don't have to restart anything, it restarts network services for you.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1SU1/adminGd/cucm_b_administration-guide-1251SU1/cucm_b_test-adminguide_chapter_011110.html
Referenced links are incorrect because CallManager service restart required for change in Domain Name of CUCM.
Here we are changing DNS, I would go for
C. restart of the network service
Else many docs suggest to restart cluster itself
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