Create constraints in multiple choice questions

I have one multiple question below:
A1. What device do you have?
a. Mobile phone
b. Laptop
c. PC
d. None of all
I want to make constraints that if respondents chose “d.None of all”, they can’t choose others (a.b.c). Please help me to guide what is the validation code for this situation!
Thank you!

Welcome @daopham,
Often the search functiin of this forum can provide help and examples, please, see Search results for 'limit choice none' - KoboToolbox Community Forum.
Furthermore, you can find hints in the Help Center articles, e.g. to restrict none choice (in a multiple_select) Limiting Responses with Validation Criteria — KoboToolbox documentation.

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Great, I have done it!

Thank you so much!

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@wroos, :clap: :heart: :partying_face: