Libermann's Nitroso test (of Amines)

[SpectraPhy09]

Homework Statement

Which of the following amine(s) will show positive Libermann's Nitroso test ?
(It is multiple choice question)
(Plz see the Options in the image I have attached)

Relevant Equations

I don't know any

My answer is coming a & c but given ans is a, b & c in my textbook.
Plz can someone give mechanism for this reaction?
Because my teacher only told that 2° and 1° Amines give the test.
So answer should be a & c na but it's wrong :(

 

[mjc123]

Why do you think b is wrong?

 

[SpectraPhy09]

My answer is coming a & c but given ans is a, b & c in my textbook.

There's a correction
My textbook says A & C but my ans was coming A, B & C

Why do you think b is wrong?

No, I think b to be correct( Sorry for the typo error)