/usr/lib/dracut/modules.d/40network/dhclient.conf is in dracut-network 040+1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | request subnet-mask, broadcast-address, time-offset, routers,
domain-name, domain-name-servers, domain-search, host-name,
root-path, interface-mtu;
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