Is the second sentence correct?
This is a dummy sentence. interk is the best service provider.
Here "interk" is the name of a service provider, which is registered with first letter small.
Is the second sentence correct?
This is a dummy sentence. interk is the best service provider.
Here "interk" is the name of a service provider, which is registered with first letter small.
In cases like this, and also examples like "pH" in science, it's often best to restructure the sentence. Then you can use the correct form of the awkward word, and start the sentence with a capital.
Registered brand and product names should always remain in their original form, no matter where they are standing in the sentence.
We respect registered trademarks the same way we do with regular names. You are supposed to write "af Gyllengrip" or "bin Laden" beginning with lowercase letters. It's the same for company names.
In your case, though, you might want to rephrase your sentence to something like:
This is a dummy sentence. I think interk is the best service provider.
or
One of the best service providers is interk.