Student Visa (F1, F2, M1, M2)

My husband's B1/b2 was rejected twice under section 214(b) but his F2 visa got approved.
(PS: For his F2 interview my husband gave all answers in detail wherever he got a chance)

Here are the questions asked:

Applicant: Good Morning
VO: Hi

VO: Can I see your passport?
Applicant: Passed the passport

VO: Handover your I-20 too.
Applicant: Both I-20s?

VO: Yes
Applicant: Passed the I-20s

VO: Did some typing on his screen.
VO: What does your wife do?
Applicant: Explained my work profile in detail.

VO: Did some more typing.
VO: When did you get married?
Applicant: Told them the date.

VO: Can you pass me the marriage certificate and photos?
Applicant: Passed

VO: How many people attended the wedding?
Applicant: Gave a detailed answer about the wedding and functions and the number of guests present in each function

VO: Did you get married under Hindu marriage act or special marriage act?
Applicant: Hindu marriage act - We got married in a temple

VO: Do you have pictures from the temple?
Applicant: Showed them photos from the temple

VO: How much do you earn?
Applicant: Told them his salary

VO: Officer went inside for a while

VO: For how long are you going there?
Applicant: 3 months

VO: How will you manage your work?
Applicant: I will be on sabbatical and I also have the sabbatical letter if you want to take a look at it

VO: No need
VO: Place your 4 fingers for fingerprint
Applicant: Placed

VO: Congratulations your visa has been approved
Applicant: Thank you