Stacy (45) and Kurt (49) are married but have lived apart since March 15, 2019. They have no divorce decree or separate maintenance agreement. Stacy will not file a joint return with Kurt. Vivienne (15), their daughter, went with Stacy when she moved out and has lived with her since. Stacy did sign Form 8332, Release/Revocation of Claim to Exemption for Child by Custodial Parent. Together, Kurt and Stacy provided more than 50% of Vivienne's support. Kurt's wages were $26,000; Stacy's were $29,850; Vivienne's gross income was $1,525. What is Stacy's correct and most favorable 2019 filing status?

1. Single.

2. Married filing jointly.

3. Married filing separately.

4. Head of household.

5. Qualifying widow(er).