Option 4 is good, except that ignoring racial information would violate the VRA, as it should (for a host of reasons). So all the options are a fail.
Not necessarily. Non partisan drawings of boundaries are usually based on geography and communities of interest, so the 'communities of interest' part might ensure majority minority districts.
Of course, the VRA has been abused by Republicans to make districts far more majority minority than they need to be in order to pack the minorities into as few districts as possible, unfortunately, frequently with the consent (and sometimes the assistance) of the Democratic Representatives of those districts.