DHCP and DNS options - which one?

and why? thank you in advance!
K BAsked:
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It is up to you, if you want your DNS records to be as complete as possible, avoid relying on the client. Select the option where your DHCP adds both A and PTR records when it allocates an IP.
K BAuthor Commented:
But, why is it up to me?
Some do not want cluttered DNS zones and leave it to the configuration of the clients which often default to auto register their network/...

Functionally one does not require the network clients to register in DNS. The only records required in DNS are for servers/resources that will be accessed by client.

Some that support workstations as well what an easy access to them which using the hostname and thus need them to register in DNS ...

Forward/reverse DNS  matching only required on the public side in some circumstances I.e. Mail server most commonly check whether the incoming connection validates reverse/forward and the greeting.
Other services vary based on each provider.

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