How do we credit Adobe Stock images on Instagram?

Hi there

If we purchase an Adobe Stock image with a standard licence and post it on Instagram do we tag/credit like this in the caption?

a) @<insert photogapher's name>

OR

b) @15638849

OR

c) @<insert photogapher's name>@15638849

And secondly - can we use purchased Adobe Stock images in our instagram feeds, so without the Adobe Stock watermark?

Please don't send the link to the terms as they don't answer this question clearly.

K 🙂