Viktor married Camille in 2015 and they have filed a joint tax return each year. They have one child together, Viktor Jr., age two. Viktor is a stay-at-home dad earning \($36,500\) as a part-time consultant. Camille earns \($325,000\) as a hedge fund manager. Unbeknownst to Viktor, Camille had been skimming money from the firm that she worked for. The firm filed a lawsuit against Camille, and the damages are \($1,200,000.\) Camille also had underreported income that she earned on the side of \($785,000\) for the current year. Viktor was shocked to learn of his wifeʼs illegal activities. Camille has left Viktor and Viktor, Jr., and they have not seen or heard from her in 9 months.

What is the most appropriate filing status for Viktor?