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D is wrong answer, /etc/services just has port mapping and that it is, to disable or enable network services I think in Linux we should use /etc/xinetd.conf.
xinetd is one of superdaemon which listen for incoming network connections and start the appropriate service on demand
ref: https://learning.lpi.org/en/learning-materials/102-500/110/110.2/110.2_01/
This file is not present on any modern distro, I checked CentOS 7 which is not that modern anymore and ubuntu 18.02 and there is only the xinetd.conf directory present with some telent file inside
"In this section we will use xinetd to intercept connections to the sshd daemon and start this daemon on request to demonstrate how the superdaemon was used."
https://learning.lpi.org/en/learning-materials/102-500/110/110.2/110.2_01/#:~:text=In%20this%20section%20we%20will%20use%20xinetd%20to%20intercept%20connections%20to%20the%20sshd%20daemon%20and%20start%20this%20daemon%20on%20request%20to%20demonstrate%20how%20the%20superdaemon%20was%20used.
Option D is wrong.
"On a Linux system, standard service ports are listed in the /etc/services file"
https://learning.lpi.org/en/learning-materials/102-500/109/109.1/109.1_02/#:~:text=On%20a%20Linux%20system%2C%20standard%20service%20ports%20are%20listed%20in%20the%20/etc/services%20file
xinetd is one of superdaemon which listen for incoming network connections and start the appropriate service on demand
ref: https://learning.lpi.org/en/learning-materials/102-500/110/110.2/110.2_01/
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