Katie and Rob were married in 2010. Katie and Rob lived together untilFebruary 2020, when Katie left Rob to go live with her new boyfriend. Katieand Rob are not divorced or legally separated as of December 31, 2020.Rob has a daughter, Emily, who is a dependent child (qualifying child) of Roband lived with Rob for all of 2020. Rob paid all costs of maintaining the homefor him and Emily for all of 2020. Rob does not know where Katie is, and hewould not be able to get Katie to sign anything.What would be the most beneficial filing status that Rob could use for 2020?Assume Rob has taxable income of $300,000.