it is A and C
"A Web browser implementing this method sends the DHCP server a DHCPINFORM query, the DHCP server will return the expected IP settings along with the 252 option which defines the location of the PAC file. The browser will then download this PAC file from the URL provided."
the dhcp does not provide the PAC file, but the url of the pac file. therefore D is not correct
https://www.cisco.com/c/en/us/td/docs/security/web_security/connector/connector3000/WPADAP.html#wp1015113
Technically speaking the DHCP server doesn't provide the PAC file itself, but the URL to download it, so I would be inclined to say that A & C are correct.
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