Confirming D.
To harden the phone, disable phone settings.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/security/12_5_1/cucm_b_security-guide-1251/cucm_b_security-guide-1251_chapter_0111.html
By default, pressing the Applications button on a Cisco IP Phone provides access to a variety of information, including phone configuration information. Disabling the Setting Access parameter in the Phone Configuration window prohibits access to all options that normally display when you press the Applications button on the phone; for example, the Contrast, Ring Type, Network Configuration, Model Information, and Status settings.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/security/10_5_2/cucm_b_security-guide-105x.pdf
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