My friend that I didn't saw for some time sent me a message and asked me "Hello friend, How are you?". What's the most appropriate / acceptable or natural way to answer him if I want to thank him about that he remembered me?
Hello, I'm fine, thank you very much for your interest.
Hello, I'm fine, thank you very much for your question.
Hello, I'm fine, thank you very much for your inquiry.
Which of the three verbs (or maybe additional ones that you know) is the correct in this context?