i was helping my wife with filling her F2 information on DS 160. towards the end it said "You have indicated the purpose of your visit is to be student or exchange visitor" and asked for SEVIS id. She had already said NO when asked if she is the principal applicant and had my information as the principal applicant. the confirmation page at the end said bring passport, proof of SEVIS fee payment and DS 2019 for interview. My questions are
1. why did it indicate she that her visit is to study even when she said she is not the principal applicant
2. SEVIS id at the end - is it her SEVIS id on her dependent I-20 or principal applicant's (my) SEVIS id
3.why did it ask to bring DS 2019 when it should be I 20 for F2.