This marketing interview question is to test your knowledge of the marketing channels that you have worked with. So, do not just mention the channels but describe how you used them to deliver successful marketing campaigns.
For example, if you have hands-on experience of using email marketing channels, you can talk about how you finalized the target audience, designed the template, planned the offer, drafted the communication message, etc. Also, talk about the open rates, CTRs, that you managed to achieve.