The correct answer is #1 on your list but only gets split if you are filing with the Married/RDP filing separately status for your CA return. You are eligible to file Married/RDP filing jointly if you would rather file that way. Since you are not legally married, you can only file Single or Head of Household, whichever applies, for your Federal return. You will then need to mark that your state return is being filed with a different filing status than your federal return.
See Registered domestic partner (RDP) for more specifics on the filing statuses on CA returns.
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