My wife (holding H4) will go back to China alone, and apply for H4 visa. I stay at US. In this case, under the travel information, is she the principal applicant? If answer is yes, then there is no "H4" option in the purpose of trip to U.S. Do I answer "no", and put my name under the prinicipal applicant, even though I am not applying for Visa? Appreciate a quick reply.