Negative form of です

I made some quizzes on Canvas LMS for my HSC preparation course students and one of the question I put was:

"My name is Catherine. It is not Cathy."
As this quiz was for the polite form, the first blank should be です and for the second one, I put:

じゃありません and ではありません only as possible answers. I must have had a mental blank!
One of my students asked me why her answer, じゃないです, got marked wrong.

Of course, じゃないです and ではないです are also correct!

We have to remember there are 4 negative forms for です!

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