Which of these user characteristics CANNOT be used to create a Custom Segment?

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Which of these user characteristics CANNOT be used to create a Custom Segment?

Users that viewed a page on your website and then watched a video
Users who have children
Users 25 to 34 years of age who have their browser set to Spanish
Users that engaged in your social media or email campaigns

Correct answer is:

Users who have children
GA
Gaurav Arora, Digital Media Lead. 10+ years running paid media and tracking for brands in the USA, UK and Canada.