This is a very badly written question question, because A is not layer 7, its layer 4. B & C are incorrect because the layer 7 methods are not round robin they hash methods (URI hash, Full URI hash, host hash and Domain hash). So really A & D are correct but only because C & D are incorrect. But the question is asking for two L7.
A & D is correct as mentionned in forti Web administration guide https://help.fortinet.com/fweb/610/index.htm#FortiWeb/CLI-reference/server_policy_server_poo.htm?Highlight=round%20robin
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