I was granted US visa under B1/B2 in April-2016 and i traveled in May-2016 for fifteen days and back. Now I am leaving once again in November for few days and my wife is also interested to travel with me. She applied under B1/B2 and told in the form that she wanted to travel with husband; my question is that is it necessary for me to go with her in embassy on interview day or she has to visit alone?